I backed up all my data to my external hard drive and now that I am attempting to retrieve it, I am prompted to format the drive. Recently, one of my family members connected the external hard drive to a MAC. Would this be the cause of this error? Can it be fixed?
This is a common problem. IF the external was unplugged during a operations, there is a possibility of hard drive corruption. Also, you mentioned it was on a MAC. If your buddy formatted the drive for the MAC (Which would be HSF) so PC won't see the filesystem anymore until you reformat for PC (FAT or NTFS).
I understand you might not was to reformat, but that is my recommended answer to this issue. There is one other choice though. Try googling Diskwarrior. This program is pretty good at repairing corrupted harddrives and it pretty good at detecting filesystems.
If disk warrior doesn't do the trick, I would go with reformating.
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Check Following Instructions:
1. Check your USB cable properly connected to the computer.
2. Go to My computer - right click on property - Hardware - Devices Manager - in below - USB Mass storage device - right click on this - and Uninstall - then again right click - click on Scan - it should be reload your USB drivers
your External Hard Drive will be detected
I decided that retrieving my data was more important that the seagate warranty and i was not prepared to send the free agent overseas with the data still on it so i removed the hard drive from the freeagent case (case now stuffed) and put the hard drive in an "off the self" hard drive enclosure". All my data was there. It is still working fine. Two big lessons for me - moving files from my lap top to the external drive is not back up and external hard drives can be fragile, best not move them around like a library book. From my low tech view the circuit board on the freeagents is flawed.
I have a seagate freeagent pro 320 gb. worked fine for over a year. all of a sudden no power at all. Plugged it into my 12v dc adapter from a western digital external HD and it works fine . I am calling Seagate tomorrow for a replacement plug.