Epson CW3S16 Operation Manual page 186

Hard Disk Performance Test
Before performing the Hard Disk Performance Test
optimize the Interleave factor. See Auto Interleave Routine
earlier in this tab for instructions.
The Performance Test determines the Data Transfer Rate and
the Track to Track Seek time based on transfer size, seek count
and data transferred. Data Transfer Rate is measured in
kilobytes per second. Track to Track Seek Time is measured in
milliseconds. To determine the transfer rate, the CPU reads
64KB blocks 15 times. Then, the CPU reads the number of
timer ticks. Transfer rate is calculated by multiplying 64KB by
15, multiplying this value by 18.2 (# of times the timer
interrupt counts in 1 set) and dividing this value by the
number of system timer ticks. Track to Track Seek Time is
calculated by multiplying the number of ticks by 1000, and
dividing this value by 18.2 times/sec x the number of Seeks
(200).
Transfer rate =
Seek Time =
The table below lists acceptable and unacceptable values for
these tests when performed on the two SCSI fixed drive
options. This information is calculated and displayed in the
Harddisk Performance Test Information box on the right side
of the screen.
To perform the Hard Disk Performance Test:
x
64KB 15 times
# system timer ticks
# timer ticks x 1000
18.2 times/set x 200 Seeks
Advanced ROM Diagnostics
x
18.2 times/set
= millisecs
= KB/sec
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