HD Tach provides only two results, the burst transfer rate and the average transfer rate. We ran the “long bench” test from this program.

Here Western Digital VelociRaptor, Seagate Barracuda 7200.10, Seagate Barracuda 7200.11 and Hitachi Deskstar P7K500 achieved the same burst transfer rate, like it happened on DiskSpeed32. They were, on average, 7% faster than Samsung HD322HJ, Hitachi Deskstar T7K500 and Western Digital Caviar SE16 – which achieved a similar burst transfer rate –, 25% faster than Western Digital Caviar RE2 and 84% faster than Western Digital Caviar SE.

The average transfer rate measured by HD Tach put Western Digital VelociRaptor and Seagate Barracuda 7200.11 on the same performance level. These two disks were, on average, 11% faster than Samsung HD322HJ, Western Digital Caviar SE and Western Digital Caviar SE16 – which achieved the same performance level –, 54% faster than Hitachi Deskstar P7K500, Seagate Barracuda 7200.10 and Western Digital RE2 – which achieved the same performance level – and 72% faster than Hitachi Deskstar T7K500.