ok list your MB and type of raid controller you are using
STEP 1 usually what u need to do is take and run your drive utility softaware and transfer your OS(partition) over from the smaller to larger(slave the larger drive to your smaller)
drive and have it expand out to encompase the entire drive,
then pull off the large drive, and use the utility alone on the small one to
format out the old small one restore it a blank fat partition and put the small one aside
reset your new big w2k drive into the place of the old drive and go for a good 2k boot, if u get it goto 2
BUT you must be formated in FAT and not NTFS for it to be that generic because most disk utility software wont transfer NTFS partitions
STEP 2
since you are using w2k and going to a raid controller from a non-raid controller setup you first want to load your raid drivers that came with your controller card into w2k then reboot,
then shut down and pull that drive, insert the large one as master on cable to the raid setup(again watch all the jumpers)
take and position your cd and cdw how you want them and jump them accordingly, possibilities are(best) cdw master ide 0, cdr master ide1 or OK cdw master, cdr slave ide0 or 1
step 3
go into bios (generic instructions)
and enable your raid controller
boot other device
and boot first from raid controller
ok turn it on
WHEN raid screen comes up watch and make sure its got your drive
then if you get a good boot into 2k shut down and then add your second drive(watch jumpers)
(note at that point before you boot into your two single raided drives stop and look at all your jumpers on CDR etc-are theY positioned as master/slave where necessary? where wanted
ok now watch your raid screen and make sure its got both your drives, do the key sequence and configure if necessary(or check) and make sure that you do not have a striped set and that your large drive is set as boot
step 4 from into 2k, format the now empty small drive, make sure all devices are picked up
enjoy
hope this helps, kinda generic
JUMPERS WILL cause you probs-screw with them till you get it right
note that sometimes singledisk raid is flakey
note that if you are using highpoint onboard you need to free up pci port 5 before enabling it, cause it shares it and dosent like to