WHOA, apparently Seagate has no ATA133 drives.

But then, its not really something to worry about. No IDE drive can transfer data faster than 40-45MB/s, which just about exceeds the capabilities of ATA33, leave alone ATA66 or ATA100.

But having said that, all you would notice is a higher burst transfer rate when it comes to ATA133 drives, say about 5-8MB/s. But there is absolutely no major change from ATA100 to ATA133 when it comes to access times, sequential transfer, seconds to load Photoshop files, etc. Total performance increase of ATA133 over ATA100 would be lesser than 5%, not to mention that ATA133 has the capacity to choke the bus, which is not a problem with ATA100. In fact, real-world performance increase would be absolutely little to even be noticed. Given all that, I would say Seagate is probably right in not harboring any lost love with ATA133.