External hard drive disappearing

I have a 675GB hard drive in a Galaxy case for my Time Machine backup. I started having some problems so I used disk utility to fix it. It tried 3 times and could not fix it. Next I tried Disk Warrior, and since there is so much data in the directory it always runs out of the 4GB memory running in my iMac. Later I was going to use Copy Carbon Cloner and it would not access it because it was locked. I looked and could not find the lock icon. Then it would not mount, but still showed up in Disk Utility, now it will not show up in disk utility, but still shows up in Disk warrior and Data Rescue 2. It is constantly spinning, like it is reading and writing, but since I cannot mount it any more, I cannot tell what is going on.
No wait, the external enclosure is showing up, but no hard drive volume.
Any ideas would be appreciated.
Message was edited by: James Mol

Is it the only device hooked up to that port, or bus of that port. Drives sometimes disappear if they have to share the bus with another port. Use the System Profiler to determine if anything is sharing the port. Alas yes this means it is very difficult to daisy chain drives.

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External hard drives disappeared

Hi
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Are the drives connected via USB or Firewire?
Look at these links.
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http://docs.info.apple.com/article.html?artnum=88338
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http://www.macfixit.com/article.php?story=20041221081432908
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

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Hi Everyone.
Got a really silly question but I can't seem to figure out where to fix this
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[Using Disk Utility in Mac OS X 10.4.3 or later|http://docs.info.apple.com/article.html?artnum=302672]
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Hi Gary, certainly frustrating.
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Open Console in Utilities & see if there are any clues or repeating messages when this happens.

My external hard drive disappeared on Windows 8

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Maybe the device is not compatible with Windows 8?
You may uninstall USB controllers from Device Manager.
Use the Mouse
=============
1. Click "Start", type in Device Manager the Search bar and press "Enter". Click Continue if necessary.
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

Lacie External Hard Drive disappeared!

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Can no longer access USB external hard drive

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Product ID:          0x0951
Vendor ID:          0x059f (LaCie)
Version:           0.00
Serial Number:          152D203380B6
Speed:          Up to 480 Mb/sec
Manufacturer:          LaCie
Location ID:          0x24300000 / 4
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Current Required (mA):          2
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Help copying files from iTunes to external hard drive

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External hard drive disappearing

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