Ultra ATA/66 versus Ultra ATA/33 Comparison

Now under Adaptec Threadmark the results are a bit surprising. The highly rated Maxtor unit shows a big performance hit when running under the Ultra ATA/33 interface, however the other drives show just a slight performance hit.

The results were so surprising that we ran the tests a few more times, than the standard 5, just to make sure it wasn’t something we overlooked. Although we don’t have a definite answer as to the large performance hit, as it seems to be too large to attribute just to the higher bandwidth that the drives cache can utilize, it does seem to scale according to the higher transfer rates.