I upgraded my PS3 to a 320gb hard drive.
I took the old 40 gb hard drive from my PS3 and put it into a 2.5" SATA Rosewill External Enclosure.
My computer (and other computers in house which run XP and Vista) will not see the hard drive when it is installed in the enclosure.
The 40gb hard drive still has the PS3 format not FAT32 or NTFS which maybe why it can not be found.
I do not own a computer that has SATA hard drives otherwise and cannot hook the 40gb to a computer internally to format it.