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- FASTER DISK ACCESS FOR MS-DOS COMPUTERS
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- This is the documentation for MAKFST.COM, a program used to patch DOS to
- speed up disk access.
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- The program and theory behind it were described in an article by
- Pat Swayne, in the August, 1986 issue of REMark, the Heath/Zenith users
- group magazine. It should be applicable and helpful to all users of
- MS-DOS PC's. It increases drive access time (not actual drive motor
- speed) without damage or increased wear to the drive.
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- BRIEF THEORY
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- A delay is included in DOS to give the disk drive heads time to bounce
- when loaded. Another delay controls the starting time for the drive
- motor. There may be drives on the market that require lengthy head
- contact and motor start times to function properly, but most of the drives
- in use do not. Several drives, such as some Shugart and Mitsubishi models
- load the heads at the moment the drive lever is rotated down and these
- drives in particular require no bounce delay. Most other drives require
- little or no bounce delay as well.
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- TESTING VARIOUS DELAY TIMES
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- You use MAKFST to permanently patch your copy of DOS with altered
- delay times. You can and should experiment with different delays to
- ascertain those appropriate for your drives. This is especially
- advisable if your system is using more than one model or brand of drive.
- You may discover that different delay times are necessary for the various
- drives attached to your PC.
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- Remember that MAKFST renders a patch to DOS. Therefore, after running
- the program you must reboot to invoke the changes. If you are
- experimenting with different delay times, you will have to reboot as many
- times as you change the delays. Once you've determined the correct times
- and run the program with those values, DOS is permanently changed and will
- boot-up as such without further intervention.
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- Pat Swayne recommends comparison of drive performance by formatting a
- diskette with the /V switch and timing the operation using various delay
- times. I found that comparisons could be made using DIR with a diskette
- having an abundance of files, though the time differences seem slight
- because of the speed at which DIR functions.
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- The primary purpose in testing delay values, is to ensure that head
- bounce does not occur. The occurrence of a bounce should be obvious
- through appearance of an error message.
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- RUNNING MAKFST.COM
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- You run MAKFST by entering (at the DOS prompt):
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- MAKFST d:n,n
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- where d: is the drive designation, and n,n are the values for head bounce
- and motor delays respectively. Each increment of delay time represents
- 1/4 second. To turn bounce delay off, set it to 0; to change to half of
- a second, set it to 2.
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- For example, if you wish a head bounce delay of 0 and a motor delay of 1
- for drive A:, you would enter:
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- MAKFST A:0,1
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- COMMENTS
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- - Remember to reboot after running MAKFST to utilize the system with
- your altered delay times.
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- - Remember that different drive models from different manufacturers may
- require particular minimum delays to function reliably -- experiment.
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- - MAKFST does not alter the speed of the drive's motor, so damage and
- increased drive wear are not a problem with this procedure. This is
- not the case with some disk speed-up utilities available.
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- - Refer to the August '86 issue of REMark for Pat Swayne's full doctrine
- on this subject as well as the assembly source code for MAKFST.
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- MAKFST.COM and this documentation file were prepared and uploaded to
- the FANTASY FACTORY Fido board by: Truman Bonney.
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