QUOTE (The_Duchess @ May 30 2007, 09:49 AM)

I haven't formatted or done anything to the 320 drive yet, but yes. The computer boots, the OS boots and the 250 HD and DVD drives work fine.
nice. you must be one of the lucky ones. have you gone into the device manager to be sure everything is ok ?
it's really up to you whether to do a clean install or not. all you need is install disk for MCE and the Key... you should be able to activate the product again on a clean install... unless the version of MCE came pre-installed on your first PC, in which case you're likely to be violating the EUA and won't be able to re-activate MCE without buying a new copy. (AFAIK anyway) perhaps you don't want to go through all the pain of a clean install anyway as everything is working ??
if you do decide to do a clean install: remove the 250 drive completely. install the 320 drive and the MCE install disk. when you get to the part of creating partitions, I would create a 200GB partition on the 320 drive and do the MCE install on that 200GB partition. (This is only temporary until you eventually get all files you want off the 250 drive. I say 200, but it could be anything, just large enough to get all the info off the 250 drive, but you don't want it to be larger than the 250. This is because when you get the the step of mirroring your new install back to the 250 drive, IIRC, you can only transfer from a smaller disk to a larger one. ie. if you make a clean install on one large 320 partition, you wouldn't be able to mirror it back to the 250 drive.... software might be different now, but when I was using Casper XP for cloning, this was a limitation... ) After getting MCE and all related drivers installed, re-connect the 250 drive (you will now be booting off the 200GB partition on the 320 drive). Load up all your programs and transfer all your files, etc. from the 250 to the 200. Once you're satisfied you have everything off the 250 drive you can reformat the 250. Last step is to mirror the 200GB onto the re-formatted 250 drive. (at this stage the 200GB partition and the 250 drive will be identical). Rearrange the drives so that the 250 is the primary boot device. You can then delete the 200GB partition on the 320 drive and re-partition/format to your liking.
Your way is certainly simplier by making a mirror of the 250 drive onto the 320 drive, then reformatting the 250 and doing the clean install, but before formatting the 250 drive, I would connect the 320 drive by itself and make sure it "took" without problems. Perhaps I just like making things harder than they should be...
good luck.
gs