|If a drive has XP or later installed on it via one computer, and you transfer the drive to another - it won't boot or run correctly; unless you run a Repair Installation. That is effectively an overwrite pf the existing installation; and is not done via Recovery Console. The registry will have entries that are specific to the computer which made that installation, switching the drive to another means those entries are invalid - and thus it won't work/boot..|
So the 27Gig drive with XP on it, was that installation made using another computer; and likewise the 30Gig?
There are various scenarios you could follow here, but post back first with how/where the 27 & 30Gig drive XP installations were created.
All modern drives are of same specification, any drive from any manufacturer ought to work in any compatable computer.
message edited by trvlr