SSD Performance HD Tach 3.0.4.0 | SiSoft Sandra HDD

HD Tach 3.0.4.0

HD Tach is a physical performance hard drive test that uses a special kernel mode VXD to get maximum accuracy by bypassing the file system.

The HD Tach sequential read test is a little bit different from other benchmarks. Most benchmarks create a file on the hard drive and test within that file. The problem is that modern hard drives use a zone bit recording technique that allows different read speeds depending on where the data is located. Data on the outside of the drive is much faster than data recorded on the inside.

Obviously for SSD this is not an issue. We do not reach the advertised 200 MB/sec though, but this is an average test .. not linear.

HDTach shows that SLC SSDs are faster when is comes to write speed, included in this test is a Silicon power 32 GB SLC drive.

In addition to sequential read, HD Tach tests the drive's random access time. Random access is the true measure of seek speed. Many drives advertise sub 10 millisecond seek speeds, but seek speeds are misleading. Also again, without a head that needs moving around, the SSDs are just soooo fast as they have no mechanical moving parts. Here obviously .. the smaller number is better, 0,2 ms (!).