External hard drive is now invisible



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External hard drive is now invisible

Postby Allan » Fri, 05 Oct 2007 08:10:27 GMT

I have a 500 GB Western Digital external hard drive that, up until now, 
has given me zero problems.

Today, the drive stopped appearing on my desktop. I checked in Disk 
Utility and can't find it there. I've shut down and restarted the 
computer many times, hoping that it would become visible again. I 
checked all the connections.

Any ideas on how to get the external drive visible again?


Re: External hard drive is now invisible

Postby Elijah Baley » Fri, 05 Oct 2007 08:26:36 GMT

In article <2007100316102775249-allan2947@gmailcom>,

Have you tried a different cable? A different port (USB or Firewire)? 
Can you plug the drive into a different computer to see if it's the 
drive or the computer?

First order of business is to isolate the problem to the drive or the 
computer it is connected to. Report back.

"Momma always said, "Stupid is as stupid does.""  -Forest Gump

"You can't fix stupid."  -Jim White, local radio personality

Re: External hard drive is now invisible

Postby massello » Fri, 05 Oct 2007 08:27:30 GMT

Does the extenal enclosure appear as a device in the USB or FireWire
sections of System Profiler? Have you tried resetting the Mac's SMU? 

You can try putting the drive in a different enclosure, but the odds are
that it has died. Does it spin up? Does it make any clicking noises? 

Re: External hard drive is now invisible

Postby Allan » Fri, 05 Oct 2007 08:46:24 GMT

On 2007-10-03 16:27:30 -0700,  XXXX@XXXXX.COM  (Neill Massello) said:

The external hard drive appears as a device in the USB Device Tree of 
the Systems Profiler as "USB High-Speed Bus/External HDD/Built-in 

The external hard drive does make clicking noises.

What is the SMU, and how do I reset it?

Thanks for your help.


Re: External hard drive is now invisible

Postby massello » Fri, 05 Oct 2007 12:36:59 GMT

The ports on your Mac appear to be working, so there's no reason to
reset the ports by resetting the SMU (System Management Unit). The next
link in the chain from your Mac to the drive would be the USB/ATA bridge
inside the enclosure, but those clicking noises indicate that it's the
drive itself that has failed. 

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