Dec 172017

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.

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
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