Dec 172017
 
Find out the interleave on your HD.
File HDISK.ZIP from The Programmer’s Corner in
Category HD Utilities
Find out the interleave on your HD.
File Name File Size Zip Size Zip Type
HD.ASM 21760 7015 deflated
HD.COM 2577 1581 deflated
HD.DOC 1350 596 deflated
HD.LST 47721 12160 deflated
TPCREAD.ME 199 165 deflated

Download File HDISK.ZIP Here

Contents of the HD.DOC file


Some simple guidelines for running hd.com program to detirmine hard disk
interleave.

1. detirmine disk param. eg. hd /i or hd /i/2 (for second dr)

2. detirmint no of sectors equiv for 10 mb (on a seagare 225, with
614 cyl and 4 heads, 10 mb is approx 300 cyl

3. run test as hd /s 300/r 300. this seeks out 300 cyl as fast
as possible, steps back verifying each track and then
reads data from 300 cylenders. returning the time reqd
for each of the abovd.

4. subtract slow step time from total read time (to get rid of it
as a factor in transfer rate calc.

5. divide 10 mb by result from 4 in seconds, this is the effective
transfer rate of the hard disk.

6. the maximum possible transfer rate is approx 622 kb/sec as
detirmined by the design 5mbit/sec and 8bit per byte

7. approx numbers then are as follows

time kb/sec interleav
17 610 1:1
34 305 2:1
50 203 3:1
66 151 4:1
83 120 5:1
100 100 6:1

8: the interleav should be 2 or 3 to 1 for a ibm AT and 4 to 1 for
the PC or XT.


 December 17, 2017  Add comments

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