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My iMac no longer recognizes external firewire WD drives.

Update:10-11Source: network consolidation
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This has occured twice in the past few months.  The first drive was a WD My Book Studio 2TB configured as Raid 1.  The more recent occurance on a WD My Book 4TB configured as Raid 1 and housing iTunes :-(  The later occurred after loading the latest Lion Update after the iMac rebooted.  Error messages say neither of the drives are recognized.  Based on my thought that the issue might have been generated by the drives not properly being dismounted on a shutdown, I swithed the drives over to a PC, successfully mounted them, and then dismounted them.  They are still not recognized by the iMac.  The Disk Utility gives me an error regardless if I try to mount or dismount the drives despite it indicating the drives are not mounted.  The iTunes drive is backed up as well as the Mac; but, I do not know what to do to fix the WD drives and I am especially leary of connecting anymore firewire drives since this appears to be hapening way too often and I do not know why.  Any help from a great sage would be greatly appreciated, especially if I can recover the two drives.
Thanks,Glenn

The Best Answer

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Try resetting the SMC.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
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