I believe ATA6 = ATA133 so you should be able to buy an ATA133 hard drive, although the ATA100 will work also but it's slower. Wait until Zingle gets here though incase i'm wrong!
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This tells you what it is.
http://www.buildorbuy.org/atapi.html
Quote:
ATA-6 (ATA-100) (5 DMA Mode) (100.0 Transfer rate MBytes/sec)
ATA-6 (ATA-133) (6 DMA Mode) (133 Transfer rate MBytes/sec)
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