Usb external disk not recognized by windows

I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
ESSENTIAL 320GB). I connected the disk to a usb port but my system is
not able to recognize the disk (WinXP Pro SP3). Other devices (usb
memory stick, mobile phone, camera) work fine at this usb port. I even
bought a USB 2.0 PCI Card but the problem remains. I tested the disk
on a laptop and another desktop pc (WinXP) and it works fine.
What can I fix so that the disk can be recognized by my system?

Thanks

<verb13@hotmail.com> wrote in message
news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com...
>I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> memory stick, mobile phone, camera) work fine at this usb port. I even
> bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> on a laptop and another desktop pc (WinXP) and it works fine.
> What can I fix so that the disk can be recognized by my system?
>
> Thanks

Run Disk Management and see if it shows up there.

SC Tom

On 5 ÌÜúïò, 03:24, "SC Tom" <s...@tom.net> wrote:
> <ver...@hotmail.com> wrote in message
>
> news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com...
>
> >I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> > ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> > not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> > memory stick, mobile phone, camera) work fine at this usb port. I even
> > bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> > on a laptop and another desktop pc (WinXP) and it works fine.
> > What can I fix so that the disk can be recognized by my system?
>
> > Thanks
>
> Run Disk Management and see if it shows up there.
>
> SC Tom


No, it does not show up there.

The disk shows up for a second in Windows Explorer and in Disk
Management but it disappears instantly.

<verb13@hotmail.com> wrote in message
news:018260a5-0977-4490-bfef-3e4498830f0b@m24g2000vbp.googlegroups.com...
> The disk shows up for a second in Windows Explorer and in Disk
> Management but it disappears instantly.

Is the port you're connecting it to on an external hub?
Are you running TweakUI? If so, check what drive letters are
enabled/disabled.
Try a different USB cable. What other USB devices are plugged in? You may be
hitting the current limit for your ports depending on what else is connected
at the same time. Plug the Passport in, go to device manager, USB
Controllers, and look at the power tab for each hub. If any are close to or
at 500 mA, that may be the problem. You can unplug the drive and click
refresh to confirm that's the device you're seeing.

SC Tom

On 5 ÌÜúïò, 14:11, "SC Tom" <s...@tom.net> wrote:
> <ver...@hotmail.com> wrote in message
>
> news:018260a5-0977-4490-bfef-3e4498830f0b@m24g2000vbp.googlegroups.com...
>
> > The disk shows up for a second in Windows Explorer and in Disk
> > Management but it disappears instantly.
>
> Is the port you're connecting it to on an external hub?

No.

> Are you running TweakUI? If so, check what drive letters are
> enabled/disabled.

I am not running TweakUI.

> Try a different USB cable.

I did.

>What other USB devices are plugged in?

Just a modem.

> You may be
> hitting the current limit for your ports depending on what else is connected
> at the same time. Plug the Passport in, go to device manager, USB
> Controllers, and look at the power tab for each hub. If any are close to or
> at 500 mA, that may be the problem. You can unplug the drive and click
> refresh to confirm that's the device you're seeing.

I have 6 "USB Root hub" items in device manager but the only device
mentioned at the Power tabs is a USB ADSL WAN Adapter for my modem.

> SC Tom

<verb13@hotmail.com> wrote in message
news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com...
>I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> memory stick, mobile phone, camera) work fine at this usb port. I even
> bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> on a laptop and another desktop pc (WinXP) and it works fine.
> What can I fix so that the disk can be recognized by my system?
>
> Thanks


verb13...
Just as a prelude to my add'l comments below...

For the past four years or so we have continually encountered situations
where a USB 2.0 device - generally involving a flash drive or USB external
hard drive - will work perfectly fine in one machine and not in another.
And, in far too many cases, we're unable to determine why this is so since
we're unable to detect any hardware/software problem in the balking machine
that would cause this non-recognition effect. It's been a most frustrating
experience for many of us.

Anyway, we've put together a more-or-less checklist for troubleshooting
these rather common USB non-recognition problems that (hopefully) may be of
some value to users encountering this type of problem...

(I fully recognize that not all the following will apply in your specific
situation or you've already tried some of these possible "fixes" without
resolving your problem, but I thought I'd list all of them for others who
may also be experiencing a problem in this area).

1. Access Disk Management and see if the USB device is listed. If so, and
there's no drive letter assigned, see if you can assign a drive letter to
the device.
2. If the USB device is listed in Disk Management with an assigned drive
letter, right-click on its listing and select Explore from the submenu.
Hopefully, Windows Explorer will open and the device will be listed.
3. Connect the USB device *directly* to a USB port on the computer, not via
a USB hub. Try different USB ports should your computer have multiple ports.
4. Avoid using a USB extension cable.
5. Try connecting a USB device (that does not contain an auxiliary power
supply) to a USB port both before and after the boot operation.
6. Where a USB (or Firewire) external HDD is involved, access Device
Manager, highlight the Disk drives listing and click on the Action menu item
and then the "Scan for hardware changes" sub-menu item. Do the same in Disk
Management > Action > Rescan disks.
7. Again, if the problem device is a USB external HDD that is not being
recognized by the system - access the BIOS and disable the "boot from USB
device" option should that setting be present in the BIOS. Ditto for "USB
legacy support" or similar setting if present.
8. Try alternate powering ON/OFF methods. If the USB device contains its own
power supply (as in the case of a USBEHD), try booting up with the device's
power on, and if the USBEHD is not detected, then try powering on the device
only *after* the system has booted to a Desktop.
9. Try a different USB cable.
10. In the USB controllers section of Device Manager, uninstall all the USB
controllers listed and reboot.
11. If the device in question is not a commercial USB external HDD but
rather one in which you installed the (PATA) HDD in a USB enclosure, jumper
the HDD as Master (or Single if the HDD is a Western Digital disk). A number
of users have reported that jumper configuration corrected their
non-recognition problem. In my own experience it has never seemed to matter
how a USB external HDD (regardless of make/model) is jumpered when installed
as a USB device in an external enclosure. But I continue to see user reports
that a jumper change resolved the problem so it may be worth a try.
12. If the device in question is a USB external HDD, first check out the HDD
with the hard drive manufacturer's diagnostic utility. If it checks out OK,
and you can remove the HDD from its enclosure (without voiding any
applicable warranty), do so and install the HDD as an internal HDD to
determine if there are problems with the disk.
13. And, of course, if you're able to uninstall the HDD from its enclosure
and have another HDD at your disposal, install the latter in the enclosure
and try that.
14. If the USB device is connected to a USB 2.0 PCI card, try changing the
card's PCI slot on the motherboard.
15. Access the website of the manufacturer of the USB device to determine if
there's any firmware update or info re the problem you're experiencing or
there's any possibility that the USB enclosure itself might be defective.
16. Determine from the manufacturer of your motherboard whether there's a
BIOS upgrade (or other software download) affecting USB device recognition.
We have encountered a few - very few - older motherboards (about five or so
years old) that exhibit USB 2.0 connectivity problems, even though they're
presumably designed for USB 2.0 capability and the installed XP OS includes
SP1 or SP2. I'm assuming your PC contains a SP since there were definite XP
OS-related USB-connectivity problems prior to the SP1 update). In a number
of those cases involving a motherboard problem an additional USB 2.0 driver
was included with the MB or available from the motherboard's manufacturer.
Theoretically there should not have been any need to install an auxiliary
USB 2.0 driver, but we found this was the only way to ensure reliable USB
2.0 connectivity. Admittedly this was a rare situation with only a very few
motherboards and we haven't encountered this identical problem with
motherboards manufactured over the past five years or so.

In your particular case, assuming you haven't already done this, refer to
item 8. above re powering on-off methods.

Also, items 7 & 10.

Also, see http://www.uwe-sieber.de/usbtrouble_e.html for add'l
troubleshooting tips.

Anyway, if you're able to resolve this problem keep us informed of the
"fix".
Anna

On 5 ÌÜúïò, 18:03, "Anna" <myn...@myisp.net> wrote:
> <ver...@hotmail.com> wrote in message
>
> news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com...
>
> >I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> > ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> > not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> > memory stick, mobile phone, camera) work fine at this usb port. I even
> > bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> > on a laptop and another desktop pc (WinXP) and it works fine.
> > What can I fix so that the disk can be recognized by my system?
>
> > Thanks
>
> verb13...
> Just as a prelude to my add'l comments below...
>
> For the past four years or so we have continually encountered situations
> where a USB 2.0 device - generally involving a flash drive or USB external
> hard drive - will work perfectly fine in one machine and not in another.
> And, in far too many cases, we're unable to determine why this is so since
> we're unable to detect any hardware/software problem in the balking machine
> that would cause this non-recognition effect. It's been a most frustrating
> experience for many of us.
>
> Anyway, we've put together a more-or-less checklist for troubleshooting
> these rather common USB non-recognition problems that (hopefully) may be of
> some value to users encountering this type of problem...
>
> (I fully recognize that not all the following will apply in your specific
> situation or you've already tried some of these possible "fixes" without
> resolving your problem, but I thought I'd list all of them for others who
> may also be experiencing a problem in this area).
>
> 1. Access Disk Management and see if the USB device is listed. If so, and
> there's no drive letter assigned, see if you can assign a drive letter to
> the device.
> 2. If the USB device is listed in Disk Management with an assigned drive
> letter, right-click on its listing and select Explore from the submenu.
> Hopefully, *Windows Explorer will open and the device will be listed.
> 3. Connect the USB device *directly* to a USB port on the computer, not via
> a USB hub. Try different USB ports should your computer have multiple ports.
> 4. Avoid using a USB extension cable.
> 5. Try connecting a USB device (that does not contain an auxiliary power
> supply) to a USB port both before and after the boot operation.
> 6. Where a USB (or Firewire) external HDD is involved, access Device
> Manager, highlight the Disk drives listing and click on the Action menu item
> and then the "Scan for hardware changes" sub-menu item. Do the same in Disk
> Management > Action > Rescan disks.
> 7. Again, if the problem device is a USB external HDD that is not being
> recognized by the system - access the BIOS and disable the "boot from USB
> device" option should that setting be present in the BIOS. Ditto for "USB
> legacy support" or similar setting if present.
> 8. Try alternate powering ON/OFF methods. If the USB device contains its own
> power supply (as in the case of a USBEHD), try booting up with the device's
> power on, and if the USBEHD is not detected, then try powering on the device
> only *after* the system has booted to a Desktop.
> 9. Try a different USB cable.
> 10. In the USB controllers section of Device Manager, uninstall all the USB
> controllers listed and reboot.
> 11. If the device in question is not a commercial USB external HDD but
> rather one in which you installed the (PATA) HDD in a USB enclosure, jumper
> the HDD as Master (or Single if the HDD is a Western Digital disk). A number
> of users have reported that jumper configuration corrected their
> non-recognition problem. In my own experience it has never seemed to matter
> how a USB external HDD (regardless of make/model) is jumpered when installed
> as a USB device in an external enclosure. But I continue to see user reports
> that a jumper change resolved the problem so it may be worth a try.
> 12. If the device in question is a USB external HDD, first check out the HDD
> with the hard drive manufacturer's diagnostic utility. If it checks out OK,
> and you can remove the HDD from its enclosure (without voiding *any
> applicable warranty), do so and install the HDD as an internal HDD to
> determine if there are problems with the disk.
> 13. And, of course, if you're able to uninstall the HDD from its enclosure
> and have another HDD at your disposal, install the latter in the enclosure
> and try that.
> 14. If the USB device is connected to a USB 2.0 PCI card, try changing the
> card's PCI slot on the motherboard.
> 15. Access the website of the manufacturer of the USB device to determineif
> there's any firmware update or info re the problem you're experiencing or
> there's any possibility that the USB enclosure itself might be defective.
> 16. Determine from the manufacturer of your motherboard whether there's a
> BIOS upgrade (or other software download) affecting USB device recognition.
> We have encountered a few - very few - older motherboards (about five or so
> years old) that exhibit USB 2.0 connectivity problems, even though they're
> presumably designed for USB 2.0 capability and the installed XP OS includes
> SP1 or SP2. I'm assuming your PC contains a SP since there were definite XP
> OS-related USB-connectivity problems prior to the SP1 update). In a number
> of those cases involving a motherboard problem an additional USB 2.0 driver
> was included with the MB or available from the motherboard's manufacturer..
> Theoretically there should not have been any need to install an auxiliary
> USB 2.0 driver, but we found this was the only way to ensure reliable USB
> 2.0 connectivity. Admittedly this was a rare situation with only a very few
> motherboards and we haven't encountered this identical problem with
> motherboards manufactured over the past five years or so.
>
> In your particular case, assuming you haven't already done this, refer to
> item 8. above re powering on-off methods.
>
> Also, items 7 & 10.
>
> Also, seehttp://www.uwe-sieber.de/usbtrouble_e.htmlfor add'l
> troubleshooting tips.
>
> Anyway, if you're able to resolve this problem keep us informed of the
> "fix".
> Anna


Thanks for your detailed answer. I tried 7, 8 and 10.
7)I did not find such settings.
8)My disk does not contain its own power supply.
10)I did it but to no avail.

Nothing worked. Finally, I booted in safe mode and the disk worked
fine!
What could the problem be?

> <ver...@hotmail.com> wrote in message
> news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com...
>
> >I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> > ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> > not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> > memory stick, mobile phone, camera) work fine at this usb port. I even
> > bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> > on a laptop and another desktop pc (WinXP) and it works fine.
> > What can I fix so that the disk can be recognized by my system?
>
> > Thanks


On 5 ÌÜúïò, 18:03, "Anna" <myn...@myisp.net> wrote:
> verb13...
> Just as a prelude to my add'l comments below...
>
> For the past four years or so we have continually encountered situations
> where a USB 2.0 device - generally involving a flash drive or USB external
> hard drive - will work perfectly fine in one machine and not in another.
> And, in far too many cases, we're unable to determine why this is so since
> we're unable to detect any hardware/software problem in the balking
> machine
> that would cause this non-recognition effect. It's been a most frustrating
> experience for many of us.
>
> Anyway, we've put together a more-or-less checklist for troubleshooting
> these rather common USB non-recognition problems that (hopefully) may be
> of
> some value to users encountering this type of problem...
>
> (I fully recognize that not all the following will apply in your specific
> situation or you've already tried some of these possible "fixes" without
> resolving your problem, but I thought I'd list all of them for others who
> may also be experiencing a problem in this area).
>
> 1. Access Disk Management and see if the USB device is listed. If so, and
> there's no drive letter assigned, see if you can assign a drive letter to
> the device.
> 2. If the USB device is listed in Disk Management with an assigned drive
> letter, right-click on its listing and select Explore from the submenu.
> Hopefully, Windows Explorer will open and the device will be listed.
> 3. Connect the USB device *directly* to a USB port on the computer, not
> via
> a USB hub. Try different USB ports should your computer have multiple
> ports.
> 4. Avoid using a USB extension cable.
> 5. Try connecting a USB device (that does not contain an auxiliary power
> supply) to a USB port both before and after the boot operation.
> 6. Where a USB (or Firewire) external HDD is involved, access Device
> Manager, highlight the Disk drives listing and click on the Action menu
> item
> and then the "Scan for hardware changes" sub-menu item. Do the same in
> Disk
> Management > Action > Rescan disks.
> 7. Again, if the problem device is a USB external HDD that is not being
> recognized by the system - access the BIOS and disable the "boot from USB
> device" option should that setting be present in the BIOS. Ditto for "USB
> legacy support" or similar setting if present.
> 8. Try alternate powering ON/OFF methods. If the USB device contains its
> own
> power supply (as in the case of a USBEHD), try booting up with the
> device's
> power on, and if the USBEHD is not detected, then try powering on the
> device
> only *after* the system has booted to a Desktop.
> 9. Try a different USB cable.
> 10. In the USB controllers section of Device Manager, uninstall all the
> USB
> controllers listed and reboot.
> 11. If the device in question is not a commercial USB external HDD but
> rather one in which you installed the (PATA) HDD in a USB enclosure,
> jumper
> the HDD as Master (or Single if the HDD is a Western Digital disk). A
> number
> of users have reported that jumper configuration corrected their
> non-recognition problem. In my own experience it has never seemed to
> matter
> how a USB external HDD (regardless of make/model) is jumpered when
> installed
> as a USB device in an external enclosure. But I continue to see user
> reports
> that a jumper change resolved the problem so it may be worth a try.
> 12. If the device in question is a USB external HDD, first check out the
> HDD
> with the hard drive manufacturer's diagnostic utility. If it checks out
> OK,
> and you can remove the HDD from its enclosure (without voiding any
> applicable warranty), do so and install the HDD as an internal HDD to
> determine if there are problems with the disk.
> 13. And, of course, if you're able to uninstall the HDD from its enclosure
> and have another HDD at your disposal, install the latter in the enclosure
> and try that.
> 14. If the USB device is connected to a USB 2.0 PCI card, try changing the
> card's PCI slot on the motherboard.
> 15. Access the website of the manufacturer of the USB device to determine
> if
> there's any firmware update or info re the problem you're experiencing or
> there's any possibility that the USB enclosure itself might be defective.
> 16. Determine from the manufacturer of your motherboard whether there's a
> BIOS upgrade (or other software download) affecting USB device
> recognition.
> We have encountered a few - very few - older motherboards (about five or
> so
> years old) that exhibit USB 2.0 connectivity problems, even though they're
> presumably designed for USB 2.0 capability and the installed XP OS
> includes
> SP1 or SP2. I'm assuming your PC contains a SP since there were definite
> XP
> OS-related USB-connectivity problems prior to the SP1 update). In a number
> of those cases involving a motherboard problem an additional USB 2.0
> driver
> was included with the MB or available from the motherboard's manufacturer.
> Theoretically there should not have been any need to install an auxiliary
> USB 2.0 driver, but we found this was the only way to ensure reliable USB
> 2.0 connectivity. Admittedly this was a rare situation with only a very
> few
> motherboards and we haven't encountered this identical problem with
> motherboards manufactured over the past five years or so.
>
> In your particular case, assuming you haven't already done this, refer to
> item 8. above re powering on-off methods.
>
> Also, items 7 & 10.
>
> Also, seehttp://www.uwe-sieber.de/usbtrouble_e.htmlfor add'l
> troubleshooting tips.
>
> Anyway, if you're able to resolve this problem keep us informed of the
> "fix".
> Anna


<verb13@hotmail.com> wrote in message
news:a3bc4556-8486-4a74-ad4d-9cf8697cbb82@z5g2000vba.googlegroups.com...
Thanks for your detailed answer. I tried 7, 8 and 10.
7)I did not find such settings.
8)My disk does not contain its own power supply.
10)I did it but to no avail.

Nothing worked. Finally, I booted in safe mode and the disk worked
fine!
What could the problem be?


verb:
Don't really know. Sounds like it might have been some kind of driver issue
so that booting into Safe Mode wouldn't have installed all the drivers that
ordinarily would have been installed during a "normal" boot. Possibly one of
those drivers was causing the non-recognition problem. In theory
uninstalling all the USB controllers from Device Manager should have done
the trick as well but obviously it didn't do so.

But are you indicating that after you were able to achieve that device
recognition following the Safe Mode boot, the system now *routinely* detects
your USB external HDD? So that it's no longer necessary to boot to Safe
Mode? Or are you indicating you must continually do this for device
recognition?

I hadn't realized your WD USB external HDD was a USB powered model, i.e.,
directly powered from the USB port of your PC. (I'm not familiar with that
particular WD model although since it's a Passport model I should have
realized it's powered by the USB bus.) I mention this because these
USB-powered external HDDs have been another source of problems we've
encountered. We've run into numerous instances where the power derived
through the PC'S USB port was insufficient to power the device. We (usually)
could overcome this through using one of those dual-head USB cables - in
effect, obtaining power through two USB ports on the PC. Many of these 2
1/2" USB external HDDs now include that type of connector.

Thanks for letting us know how you resolved the problem. And could you
respond to my query above as to whether it's *always* necessary to boot to
Safe Mode for device recognition?
Anna

On 6 Μάϊος, 00:08, "Anna" <myn...@myisp.net> wrote:
> > <ver...@hotmail.com> wrote in message
> >news:1a050b83-3871-4b76-b7de-2e45dde359bd@s28g2000vbp.googlegroups.com....
>
> > >I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> > > ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> > > not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> > > memory stick, mobile phone, camera) work fine at this usb port. I even
> > > bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> > > on a laptop and another desktop pc (WinXP) and it works fine.
> > > What can I fix so that the disk can be recognized by my system?
>
> > > Thanks
>
> On 5 ÌÜúïò, 18:03, "Anna" <myn...@myisp.net> wrote:
>
>
>
>
>
> > verb13...
> > Just as a prelude to my add'l comments below...
>
> > For the past four years or so we have continually encountered situations
> > where a USB 2.0 device - generally involving a flash drive or USB external
> > hard drive - will work perfectly fine in one machine and not in another..
> > And, in far too many cases, we're unable to determine why this is so since
> > we're unable to detect any hardware/software problem in the balking
> > machine
> > that would cause this non-recognition effect. It's been a most frustrating
> > experience for many of us.
>
> > Anyway, we've put together a more-or-less checklist for troubleshooting
> > these rather common USB non-recognition problems that (hopefully) may be
> > of
> > some value to users encountering this type of problem...
>
> > (I fully recognize that not all the following will apply in your specific
> > situation or you've already tried some of these possible "fixes" without
> > resolving your problem, but I thought I'd list all of them for others who
> > may also be experiencing a problem in this area).
>
> > 1. Access Disk Management and see if the USB device is listed. If so, and
> > there's no drive letter assigned, see if you can assign a drive letter to
> > the device.
> > 2. If the USB device is listed in Disk Management with an assigned drive
> > letter, right-click on its listing and select Explore from the submenu.
> > Hopefully, Windows Explorer will open and the device will be listed.
> > 3. Connect the USB device *directly* to a USB port on the computer, not
> > via
> > a USB hub. Try different USB ports should your computer have multiple
> > ports.
> > 4. Avoid using a USB extension cable.
> > 5. Try connecting a USB device (that does not contain an auxiliary power
> > supply) to a USB port both before and after the boot operation.
> > 6. Where a USB (or Firewire) external HDD is involved, access Device
> > Manager, highlight the Disk drives listing and click on the Action menu
> > item
> > and then the "Scan for hardware changes" sub-menu item. Do the same in
> > Disk
> > Management > Action > Rescan disks.
> > 7. Again, if the problem device is a USB external HDD that is not being
> > recognized by the system - access the BIOS and disable the "boot from USB
> > device" option should that setting be present in the BIOS. Ditto for "USB
> > legacy support" or similar setting if present.
> > 8. Try alternate powering ON/OFF methods. If the USB device contains its
> > own
> > power supply (as in the case of a USBEHD), try booting up with the
> > device's
> > power on, and if the USBEHD is not detected, then try powering on the
> > device
> > only *after* the system has booted to a Desktop.
> > 9. Try a different USB cable.
> > 10. In the USB controllers section of Device Manager, uninstall all the
> > USB
> > controllers listed and reboot.
> > 11. If the device in question is not a commercial USB external HDD but
> > rather one in which you installed the (PATA) HDD in a USB enclosure,
> > jumper
> > the HDD as Master (or Single if the HDD is a Western Digital disk). A
> > number
> > of users have reported that jumper configuration corrected their
> > non-recognition problem. In my own experience it has never seemed to
> > matter
> > how a USB external HDD (regardless of make/model) is jumpered when
> > installed
> > as a USB device in an external enclosure. But I continue to see user
> > reports
> > that a jumper change resolved the problem so it may be worth a try.
> > 12. If the device in question is a USB external HDD, first check out the
> > HDD
> > with the hard drive manufacturer's diagnostic utility. If it checks out
> > OK,
> > and you can remove the HDD from its enclosure (without voiding any
> > applicable warranty), do so and install the HDD as an internal HDD to
> > determine if there are problems with the disk.
> > 13. And, of course, if you're able to uninstall the HDD from its enclosure
> > and have another HDD at your disposal, install the latter in the enclosure
> > and try that.
> > 14. If the USB device is connected to a USB 2.0 PCI card, try changing the
> > card's PCI slot on the motherboard.
> > 15. Access the website of the manufacturer of the USB device to determine
> > if
> > there's any firmware update or info re the problem you're experiencing or
> > there's any possibility that the USB enclosure itself might be defective.
> > 16. Determine from the manufacturer of your motherboard whether there'sa
> > BIOS upgrade (or other software download) affecting USB device
> > recognition.
> > We have encountered a few - very few - older motherboards (about five or
> > so
> > years old) that exhibit USB 2.0 connectivity problems, even though they're
> > presumably designed for USB 2.0 capability and the installed XP OS
> > includes
> > SP1 or SP2. I'm assuming your PC contains a SP since there were definite
> > XP
> > OS-related USB-connectivity problems prior to the SP1 update). In a number
> > of those cases involving a motherboard problem an additional USB 2.0
> > driver
> > was included with the MB or available from the motherboard's manufacturer.
> > Theoretically there should not have been any need to install an auxiliary
> > USB 2.0 driver, but we found this was the only way to ensure reliable USB
> > 2.0 connectivity. Admittedly this was a rare situation with only a very
> > few
> > motherboards and we haven't encountered this identical problem with
> > motherboards manufactured over the past five years or so.
>
> > In your particular case, assuming you haven't already done this, refer to
> > item 8. above re powering on-off methods.
>
> > Also, items 7 & 10.
>
> > Also, seehttp://www.uwe-sieber.de/usbtrouble_e.htmlforadd'l
> > troubleshooting tips.
>
> > Anyway, if you're able to resolve this problem keep us informed of the
> > "fix".
> > Anna
> <ver...@hotmail.com> wrote in message
>
> news:a3bc4556-8486-4a74-ad4d-9cf8697cbb82@z5g2000vba.googlegroups.com...
> Thanks for your detailed answer. I tried 7, 8 and 10.
> 7)I did not find such settings.
> 8)My disk does not contain its own power supply.
> 10)I did it but to no avail.
>
> Nothing worked. Finally, I booted in safe mode and the disk worked
> fine!
> What could the problem be?
>
> verb:
> Don't really know. Sounds like it might have been some kind of driver issue
> so that booting into Safe Mode wouldn't have installed all the drivers that
> ordinarily would have been installed during a "normal" boot. Possibly oneof
> those drivers was causing the non-recognition problem. In theory
> uninstalling all the USB controllers from Device Manager should have done
> the trick as well but obviously it didn't do so.
>
> But are you indicating that after you were able to achieve that device
> recognition following the Safe Mode boot, the system now *routinely* detects
> your USB external HDD? So that it's no longer necessary to boot to Safe
> Mode? Or are you indicating you must continually do this for device
> recognition?
>
> I hadn't realized your WD USB external HDD was a USB powered model, i.e.,
> directly powered from the USB port of your PC. (I'm not familiar with that
> particular WD model although since it's a Passport model I should have
> realized it's powered by the USB bus.) I mention this because these
> USB-powered external HDDs have been another source of problems we've
> encountered. We've run into numerous instances where the power derived
> through the PC'S USB port was insufficient to power the device. We (usually)
> could overcome this through using one of those dual-head USB cables - in
> effect, obtaining power through two USB ports on the PC. Many of these 2
> 1/2" USB external HDDs now include that type of connector.
>
> Thanks for letting us know how you resolved the problem. And could you
> respond to my query above as to whether it's *always* necessary to boot to
> Safe Mode for device recognition?
> Anna- ΑπόκÏ�υψη κειμÎ*νου σε παÏ�άθεση -
>
> - Εμφάνιση κειμÎ*νου σε παÏ�άθεση -


Yes, it only works in safe mode.
Maybe I can try the dual-head USB cable solution.

Doesn't MS have a fix for this issue? I download there 'upgrade' and now my
USB hard drive doesn't work. Don't they test these 'upgrades' before
releasing them?


"verb13@hotmail.com" wrote:

> I bought an external hard disk (WESTERN DIGITAL WDMEB3200TE PASSPORT
> ESSENTIAL 320GB). I connected the disk to a usb port but my system is
> not able to recognize the disk (WinXP Pro SP3). Other devices (usb
> memory stick, mobile phone, camera) work fine at this usb port. I even
> bought a USB 2.0 PCI Card but the problem remains. I tested the disk
> on a laptop and another desktop pc (WinXP) and it works fine.
> What can I fix so that the disk can be recognized by my system?
>
> Thanks
>