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Bought caddy.

Took out old 40GB drive which was the original HD out of the Comp
which was not connected with the intention of putting it in the caddy,
also disconnected IDE cables to get at things. Reconnected the running
160 GB hard drive and it cant be found and although Windows starts it
just crashes. Put the 160 GB (two partitions) in the caddy and sure
enough it can be seen. The original 40 was copied to the then new 160
via Maxwell HD utility.

The old 40GB is back in and boots up no problem.

Thought I a repair install, Windows goes through the prelims and
then - cant find any hard drive mate!
The HD is set as the secondary IDE master.

Got a feeling this is a bios or HD drive number thing but out of my
depth here.

Any help very much appreciated.