HDTach 3.0.4.0

  HD Tach is a test of physical performance hard drives that use a special kernel mode VXD to get maximum accuracy by bypassing the file system. The same mechanism is used in Windows NT / 2000 HD Tach sequential read test is a little different from other benchmarks. Most benchmarks create a file on your hard drive and test within that file. The problem is that modern hard drives use a zone bit recording technique that allows the reading speed is different depending on where the data is located. Data outside the drive is much faster than the data recorded on the inside.

  HD Tach reads from areas all over the hard drive and report the average speed. It also logs the speed of reading to a text file that you can load into a spreadsheet and graph to visually read the test results.

  In addition to sequential read, HD Tach tests the drive random access time. Random access is the true measure of seek speed. Many drives advertise sub 10 millisecond seek speeds, but seek speeds misleading.

  Finally, HD Tach tests the drive burst speed. Burst speed data rates can be accessed from the on-board memory read-ahead drive. It measures the speed of the drive and controller interface. The registered version of the HD Tach test add write and Windows NT 2000 support /.

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