Drive not found on mac when connected via usb
Thanks for using FixYa. There are a few reasons this can happen.
1. Your Mac has corrupted systems files.
2. The USB Cable Could be faulty.
3. The AC adapter could be faulty.
4. The enclosure Could be faulty.
5. The drive in the enclosure could be faulty.
The easiest two to test are the USB cable and corruption on your Mac.
Try connecting the drive to a different computer. If it works your system is corrupted, Archive and re-install your Mac and this should repair the problem. If that fails try a different USB cable, if it works, problem solved. If they both fail, move onto the AC adapter. Take the drive and enclosure to a PC shop and have the techs test the AC adapter with a multi-meter, if it checks out then we're down to the enclosure or drive if it doesn't test with a replacement.(Important, use an actual PC shop, not a big box, Most of the $8/hr staff at the big box stores don't know how to use a multi-meter let alone the next step). If the replacement fails or if the AC adapter tests good then the problem is either in the Enclosure or harddrive. The PC shop should be able to test the drive in a new enclosure if the above steps failed, if it works in a new enclosure the fault was in your enclosure, buy the new enclosure and be on your way.
Finally, if all the above steps fail then the fault is in the actual hard drive. If this is the case you will require the help of a pro to retrieve the data. I will be happy to refer you to an appropriate facility if this is the case. If it is the case reply with your location(city, state and country) and I will provide one or more nearby options and help you get checked in to their system.
Hope this helps FixYa,
on Oct 20, 2009