Go to Control Panel/Administrative Tools/Computer Management/Disk
Management ans see if it appears there. If it does not then there may
well be a problem with the hard drive or the caddy.

If it does then it will probably be in black, a different colour from
the other hard drives.

If here is a red cross next to the name right click on it and select
initialize.

The red cross will disappear.

next right click on the drive and select format. after what seems like
many days the format will be complete and the drive should be
recognised.


--
oldun