I have an old Hd I would like to load another OS onto can I connect it to my new unit and COPY the OS from my new unit? Part 2 My old HD carshed I don't have the win98 disk to re-install it ,but I do have a good xp os on my new unit .Can I install the old HD temporary to install xp on it?Seems to be two questions with different approaches...

what do you want to do, put the HD into a new system and do a fresh install, or have your existing OS on the HD work for the new system?

For the second option, my first instincts would be no due to the drivers for your mainboard/GFX etc... but I could be wrong... someone else may be able to help more...What exactly is it you want to accomplish here ? ?

Even still i'll still give you some things to consider.....

If it's an older drive and you clone your existing OS to it and use it as a bootable drive chances are that it will run ALOT slower than you are used to. HDD technology has ALMOST kept up with the times.

Secondly what happens to your existing drive ? ?

Are you planning on dual-booting 2 different OS's on one MACHINE ? ? This works well when SETUP properly but again we need to know what you are attempting here.