OCZ Vertex 120 GB SSD review

Memory (DDR4/DDR5) and Storage (SSD/NVMe) 367 Page 10 of 12 Published by

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SSD Performance HD Tach 3.0.4.0

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 performance here though, but this is not a linear test method.

In addition to sequential read performance, 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 physical 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, 0.1 ms (!).

OCZ Vertex SSD review

Now I'd like to show you something. HD-Tach quite honestly is aimed at HDDs, it's fairly old software. So I am not yet sure what to make of the write results. For the sake of validity and objectivity I wanted to include the above test, which shows below 100 MB/sec write speeds. I have no explanation for this.

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