External hard drive not recognized after time machine locked up

I was backing up to an external hard drive (300GB Western Digital) and time machine locked up. I had to shut down the computer and restart. Now the external hard drive does not show up on the desktop?
I can see it in disk utility but I am not able to mount or unmount the disk, I keep getting an error that the disk is in use. I tried to erase/reformat the disk and no luck.
Any suggestions?
Thanks for the help

KTM450rider wrote:
Do I need to boot from the install DVD?
this is often the easiest and eliminates any "busy drive" problems. what's wrong with booting from the install DVD? takes a couple of minutes.
My main hard drive is OK... the drive that I am having problems with is an external hard drive that I was using to back up my lap top. I just want to get the external drive reformatted, but disk utility will not erase it. I get an error that disk utility shut down, "please check the drive and make sure that the drive is not in use or programs are still running"
Is their a way to do a hard or forced reformatting of an external hard drive, I don't care about the information on the drive
I also tried disk warrior to recover the info on the disk and all it does is crash my mac pro????
Thanks again for the help

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I did go into the software management of the drive and found an area in which to turn Time Machine on on the drive's side. Which I never did before so I turned it on and then I'm prompted to enter the name of the computer and the ethernet ID. I entered the name of the iMac and I have tried using the WiFI MAC address - no luck getting TIme Machine to work and I've also entered Terminal, found a MAC address under the line titled "ether" and still the same result.
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Is it a firewire ext. HD?
Yes, many are reporting same, there is a firewire fault and TB HD on external HD from LaCie (Seagate) and from WD especially.
Technicians are looking into it.
Until there is resolution, consider setting up a USB ext. Time machine HD.
Until then consider confining Mavericks use with USB HD.
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Triple-click anywhere in the line below to select it:
tmutil compare -E
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
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Contrary to the other two replies, I will relate what I've read here: WD drives are fine, but their (cheap?) enclosures are subject to failure. Some buy a bare WD drive and install it in an Oxford Chip external enclosure (OWC / macsales.com would be one source). And, I have two LaCie Quadras and one OWC Mercury Pro - both are generally recommended here. If you want it bootable, most WD drives do not support it:
http://wdc.custhelp.com/app/answers/detail/a_id/1787/related/1/session/L2F2LzEvd GltZS8xMzUxNTIzMzIwL3NpZC9ueUFYc1g5bA%3D%3D
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Hello, eco1.
Thank you for visiting Apple Support Communities.
This sounds like you are wanting to move your iTunes media folder to an external drive and have iTunes this folder from this location. If this is the case then I would recommend taking a look at the article below.
iTunes for Mac: Moving your iTunes Media folder
http://support.apple.com/kb/ht1449
Cheers,
Jason H.

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