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.
When we look at average (not peak!) write performance we see 193 MB/sec in this test with 346 MB sequential read speeds. 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 as well 312 MB/sec by the way.
Crucial M4 128GB SSD review We finally test the Crucial M4 128GB SSD and will check out the performance of this very popular SSD. Obviously the M4 series is nothing other then a success story, and with a lot of people not trusting SandForce anymore we'll have a peek, after which we'll dive into the technology behind it and obviously we'll present you a nice phat performance overview.