1. In case the problem is that you can see the FireWire drive in the sidebar and not on desktop, then go to Finder preferences and move to General and select “CDs, DVDs and iPods”
2. Keep the FireWire connected and turn it on before the Mac boots and make sure it remains on throughout the booting process
3. You will need to Reset your Primary RAM (PRAM) and Non Volatile RAM (NVRAM).
4. Try resetting the power management chip of your Mac, be careful when you do this
5. If the problem has started after installation of a Mac OS Update and even CD, DVD is not getting mounted then you should be following the following steps:
a. Go to run and type in applications to move to Utilities followed by disk utility
b. Go to the leftmost corner out there and click on ‘Macintosh HD’ after which you need to press on the ‘Repair Disk Permission’ button
c. Once the process is over, you will need to delete the file /System/Library/Extension.kextcache
d. Once you are done with this deletion, go to System/Library/Caches/com.apple.kernalcaches/ and delete this folder
e. Now restart the PC so that the changes can be applied as expected
6. Even though the solution technically revolves around a particular update but this has proven record of solving some major FireWire issues
7. Check and confirm with the manufacturer of your FireWire in order to confirm if there is any new patch or firmware update available as such
8. The partition might have got corrupted If you have not Ejected a FireWire drive before it was either disconnected or powered off
9. This can lead drive to failing to mount. In case of a power failure also, the FireWire drive which uses mains power, can have the same effect as powering off the drive without first ejection
10. Disconnection of storage devices without properly ehecting it or closing it, might corrupt the entire device. Always, disconnect it by:
a. You can do that by simply dragging the icon of the device to Trash
b. You can also Control-click the drive’s icon and select the eject in the Disk utility toolbar
c. Go to the disk utility, select the device you wish to eject and select eject in there
11. It can definitely be corrected using repartition and reformat technique on the drive giving issue
12. If you want you can recover the data that is already in there using recovery tools or simply recovery methods
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