You do not appear to have given deatils of two drives.
ATA drives are now either 100, 133. This reflects their access speed.
The cache is 2mb or 8MB this is another factor which increases access speed.
5400 and 7200 are the speed which the disks revolve at -= again the faster it spins the quicker data can be accessed.
So a 133ATA, 8MB cache 7200rpm drive is faster than a 100ATA 2MB cache 5400rpm drive.