I took the drives out of the case just to make sure......
On one drive there is a sticker that says:
Seagate Barracuda, 7200.11, 3.5IN, 500GB SATA2, .5MS 7200RPM, 2MB Cache, NCQ Hard Drive.
The other HDD has no such sticker on it, maybe I removed it or it fell off, but it is the sticker with the "warranty void if removed" warning.
Both drives are identical ones. They are: ST3500320AS, P/N 9BX154-303
According to Newegg the ST3500320AS has a buffer size of 32MB.
So, which will be better still? The two 500GB in RAID 0 or the single 1TB Caviar Black from WD?