Whb
Yes it is possible to buy a cradle to put the hard disk in, which can then be linked to the PC as an external Hard Disk. I did it myself some time ago.

Here is a link in the states that may help

http://askbobrankin.com/convert_internal_hard_drive_to_external.html

Here is a link to a UK site

http://www.ehow.com/how_5518748_make-hard-drive-out-internal.html

Hope that helps a bit.