If it is not being seen in disk management then it is likely a communication problem with the USB enclosure (box holding the hard drive) and the computer.
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The other option is to run data recovery software on it and you should be able to tree the hard drive, move the files off, repartition/reformat, and move the data back. If it is then it is likely that the drives problem is a MBR (master boot record/partition record) problem that can easily be fixed with something like a remote recovery. You would need to go to disk management and then see if it is reporting as a mass storage device in the machine. So this gets a little tricky because just because “My Computer” isn’t seeing the drive it does not mean the computer is not seeing the drive. I’ve tried it on a different computer and had the same result It says “you may safely remove hardware” in the task bar My USB drives all work and I have other hard drives on the computer I follow the wizard steps and it says “successfully installed” but I cannot find my hard drive. When I plug it in to either the USB or FireWire ports the computer detects and the instillation wizard pops up.
I have a 1TB Western Digital My book Hard drive. As always please leave a comment if you have a question or contact me directly at 72 ext 236. I have given what I think is the best solution to these problems. Below are some more fun Q&A about hard drive recovery.