Maxtor DiamondMax 10 300GB Hard Drive
(Ultra ATA-133, 7,200RPM, 16MB - SKU: 6L300R0)
Price Range: $119.90 (OEM) - $174.00 from 35 Sellers
I would get that one. I would not get the western digital drive. I rather buy seagate as a second choice.
ATA133 is just a faster version of ATA100 realy, but they are backward compatible, if your computer can only run ATA100 (and slower) then the drive will be ata100, the numberpart of ATAxxx is the theoretical max transfer speed over the hard drive cable.
ATA vs IDE: There are several views. Some say they are the same, some say ata is a new version of ide, oterhs say ide refers to the physical aspects and ata to the protocol used for transfer. I sayed IDE just not to confuse ata with sata.
http://en.wikipedia.org/wiki/Advance...ogy_Attachment