OCZ Vertex 3 240GB review -
SSD Performance HD Tach 18.104.22.168
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.
With this test we never ever reach advertised speeds, so please don't worry about that. What absolutely surprised us was the fact that the SSD reached way higher numbers then the Vertex 3 PRO. This software is starting to confuse me a little for real.
When we look at write performance we see 355 MB/sec in this test, and that's okay for this drive.
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 moves around, the SSDs are just so fast as they have no mechanical moving parts. Here obviously, the smaller the number is, the better. In this case, 0.1 ms.
The Burst speed measured in HD Tach was 378 MB/sec by the way. Check the test result here.
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