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Thread: Toshiba portable hard drive 250gb usb 2.0 missing

  1. #1
    Join Date
    Apr 2010
    Posts
    78

    Toshiba portable hard drive 250gb usb 2.0 missing

    I just bought a Toshiba portable hard drive 250gb usb, and my surprise, it is not detected as USB 2.0. I am entitled to nice little message: "This device could run faster" .. I scratch a little short in the PC, and I noticed that my USB control is recognized as a "USB host controller Open HCD standard. Well now, I think the problem comes from there, the USB controller is not recognized as expanded. Can anybody have any idea what is the issue with my external hard drive or USB port. Thanks.

  2. #2
    Join Date
    Oct 2008
    Posts
    780

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    To resolve this problem, follow these steps:
    1. Start the Device Manager.
    2. In the Action menu, click Scan for hardware changes. If this does not solve the problem, you must restart the computer. In some cases, you must use Device Manager to disable then re-enable the device to unlock it.

  3. #3
    Join Date
    Dec 2008
    Posts
    950

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    To prevent this problem on server products on which the power management is not important or required, you can disable USB selective suspend. To do this, you must modify the following registry entry:
    HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Services \ USB
    Entry: DisableSelectiveSuspend
    Type: DWORD
    Value: 1 disables selective suspend. 0 enables selective suspend
    Note: If this registry key is not present, you must create it.
    This setting affects all drivers USB host controller in the system. DisableSelectiveSuspend If set to 1, the Selective Suspend feature is disabled and the checkbox Allow the computer to turn off this device to save energy does not appear under the tab Power Management USB Root Hub.

  4. #4
    Join Date
    Oct 2008
    Posts
    951

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    In Device Manager, double-click menu on the Universal Serial Bus Controllers, then one of the hubs USB Root.
    1) Click on Start / Stop. In the information section of the concentrator, the total power available per port (usually 500 mA) will be indicated. The Attached Devices section indicates the number of ports supported.
    2) Double-click a host controllers.
    3) Click the Driver tab and then click the Details button driver. It may be that you have this type of information: uhci (for USB1) ohci (for USB1.1) and ehci (for USB2).

  5. #5
    Join Date
    May 2008
    Posts
    5,937

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    You can also have an error in the power of USB ports.
    1) Go into the BIOS of your computer, then disable all USB functions. The order will be presented in a menu as Integrated Peripherals or Advanced Chipset Features and may be called Onboard On Chip USB Function or USB.
    2) Reboot normally and then uninstall all programs relevant to your devices USB by using the Add / Remove Programs Control Panel.
    3) Still in Control Panel, double-click System Properties applet, then click on the Hardware tab and button Manager devices.
    4) Double-click the Universal Serial Bus controllers branch.
    5) With the right mouse button, click the first device listed, then click Uninstall.
    6) Repeat the same operation for each other devices present in this section.
    You've got to start with hubs root.

  6. #6
    Join Date
    Jan 2006
    Posts
    6,878

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    Also check the USB for usb 2.0 support
    1) Click on Start/Run and enter Regedit
    2) Open HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Enum.
    3) With the right mouse button click on the key Enum then click Permissions.
    The permissions for the SYSTEM group must be following: Read and Full Control.The permissions for the Everyone group must be follows: Reading. If necessary make the necessary changes. Eventually, and if it does not after reboot, the permissions for the administrator group must be the same as the SYSTEM group.
    4) Click the Advanced button.
    5) Check the box Replace permission entries of all child objects.
    6) Confirm to the res .This trick works before or after the installation Service Pack 2.

  7. #7
    Join Date
    Feb 2010
    Posts
    125

    Re: Toshiba portable hard drive 250gb usb 2.0 missing

    You need to also reinstalling a USB device reported as "Unknown Device":
    1) In Device Manager select the display of hidden devices and delete all occurrences listed as being in error.
    2) In the registry open HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion.
    3) Edit an expandable string value called DevicePath.
    4) Enter the value data as follows:% systemroot% \ inf,% SystemDrive% \ driver \ driver1,% SystemDrive% \ driver \ driver2
    5) Then, open HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Setup.
    6) Edit an expandable string value called DriverCachePath.
    7) Enter the value data as follows:% systemroot% \ Driver Cache
    8) Open HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Class \ 4D36E980-E325-(11CE-BFC1-08002BE10318).
    9) Remove the string values named UpperFilters and LowerFilters.
    10) Repeat the same for this registry tree: HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Class \ (4D36E967-E325-11CE-BFC1-08002BE10318).
    11) In Windows Explorer open C: \ WINDOWS \ inf.
    12) Delete this file: infcache.1.
    13) Restart your computer.

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