Why can't I see my second hard disk?

I have a SATA 160-GB hard disk that won't boot.  I'm trying to connect it as a second drive in another desktop PC, in order to read and save the data files.
When I go into BIOS, the BIOS sees the drive correctly.

But when I boot the machine, Windows Explorer doesn't see it.  When I go into Computer Management --> Disk Management, this disk shows up as Offline.  The error message reads "The disk i offline because it has a signature collision with another disk that is online".

What can I do to read/repair this drive?  Thanks
Dwight BaerStudentAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
From:
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/after-installing-a-second-wd-1tb-my-book-drive/28fe3c13-713a-449c-ac4d-4f22d9f70f8e

Command prompt:

type in "DiskPart"
(this brings up a separate window in Win 7 . . . you may get prompted for UAC)
type "List Disk"
(This will show you which disks can by physically seen, offline and online)
type "select disk X"
(Where x is the number of the disk you want to make online)
type "online disk"
(This should bring you a message saying your disk is now online)
type "Exit"
This takes you back to windows and you should now see your disk through Windows Explorer.
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Dwight BaerStudentAuthor Commented:
Perfect.  Thanks.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You have a signature collision. For more information on fixing them, I'd recommend http://blogs.technet.com/b/markrussinovich/archive/2011/11/08/3463572.aspx if you want to keep the data on the drive.
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Dwight BaerStudentAuthor Commented:
Hmmm... Very interesting article.

The diskpart solution (above) worked for me.  I guess I was lucky.
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