IMPORTANT NOTE:  HD Tach 2.61 may be incompatible with autoinsert notification 
on some Windows 95/98 systems.  This incompatibility will cause a blue screen
error.  If this error occurs you must disable autoinsert to run the test.  
Disable autoinsert by using Control Panel.  From Control Panel double click
System, then Device Manager, then CDROM, then disable autoinsert in the Settings
of each CDROM drive.  You must reboot for this change to take effect.  After
running HD Tach you can enable autoinsert through the same procedure.

HD Tach 2.61
   * Fixed a bug with removable drive (ZIP, Jazz, floppy, LS-120) support.

HD Tach 2.60
   * Added advanced size check (for large drives that are detected as 8gb
     instead of their actual size).
   * Improved efficiency of burst test to detect higher (Ultra66/U2W SCSI)
     burst rates.

HD Tach 2.54

   * Fixed a bug that allowed hard drive caches to affect write benchmark
   * New code to calculate drive length and sector size - should work
     better with larger drives and RAID arrays
   * Updated burst speed graph to account for UltraSCSI devices
     (the log file hdtach.log results were always accurate)

HD Tach 2.53

   * Workaround for write speed test - drive caches were inflating numbers.

HD Tach 2.52

   * Support for floppy drive and LS120 floppy added! Be patient!
   * Windows NT support only available in registered version
   * Write test only available in registered version

HD Tach will show a list of drives in the system.  In the unregistered version,
(Read Only) will be displayed by each drive - the write test is disabled.
The drive letters (if any) representing each drive will also be displayed
along with the system ID string for the drive.  In the registered version
(Read/Write) will be displayed next to hard drives that are not partitioned
and removable media drives.  You may only execute the write test on drives
that display (Read/Write).

REMOVABLE MEDIA DRIVES: (FLOPPY, JAZZ, ZIP, ETC)
Before loading HD Tach make certain that a formatted disk is loaded and
initialized in the drive.  Registered users: After write testing a removable
media disk you must format it before testing again.

Access time (in ms) - time to read one random sector from the hard drive.
Includes seek time, latency, and read one sector.

Burst speed - maximum speed of the computer to hard drive interface.  This
represents the speed of data transferred from the hard drive on-board-cache to
the system memory.

Speed per zone - The test is performed in 32mb zones.  For each zone 1mb is
read and the result is written to HDTACH.LOG.

Average speed (after test complete) - the speed from each zone averaged.

You can load HDTACH.LOG into a spreadsheet to graph the results.  Each 32mb
block from the hard drive has a value in kilobytes per second.  Dips in the
middle of a graph do not generally mean the hard drive is defective.  It is
more likely that some other component of the computer interfered with the
test and slowed the results briefly.

For best results, disable network adapters, screen savers, autoinsert
notification, and any other task that might affect the benchmark.  During
the test do not move the mouse.