there are a lot of things that work on the 6 pin power supplied cables. the external 2.5 " drive cases, can run off the power. non of the 3.5" drive cases will because its too much power.
Personally i have a 10 gig ibm deskstar. An upgrade place said my computer can take a 12.5mm drive, but it really doesnt look like it. The 32 and 48 gigs are 12.5mm drives, and have basically same platter density and access times based on IBM's spec sheets as the 9.5mm 4200rpm drives, but spin 25% faster. I dont know if its worth the money though. ON ebay the 32 and 48 are around $350 and 600respectively. I already have a 40 gig external fujitsu firewire drive. So i dont really need the space, just the speed, but i don tthink i can justify $350+ dollar sfor a 25% faster transfer rate . I was saying the 32 gig is expensive, since you can find a 4200 rpm fujitsu on ebay for $200. and the 20 gig ibm deskstar is only around $100 now
pariah i just looked at your system specs. that is a gross laptop you have. man i drool.. its supposed to be exactly the same as one of the omni book series. i have a HP laptop too, gonna upgrade the cpu soon. figured that is much cheaper than a new drive, only cost me like $35 (after i sell the old one) to upgrade it 100mhz.