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SPACE - Library 2 - Volume 1.iso
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1986-10-16
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68 lines
I wondering if diskette I/O could be speeded up by changing
the sector interleave. This is the results of my testing.
Test Environment:
520 st with added memory & TOS in ROM. All operation through GEM.
Double sided drive.
512k Ram disk.
Monochrome Monitor.
Test Procedure:
Phase 1 - Format 10 Diskettes with a recent PD offering allowing
input of interleave, incrementing interleave on each.
Format 1 Diskette with Atari's format. Interleave not
adjustable.
Format 1 Diskette with OSS Format, another PD offering
that increases number of sectors and tracks. Interleave
not adjustable.
Phase 2 - Copy 430,875 bytes of data from ram disk to each diskette. No
alteration of verification. This phase tests the
writing of data to the diskette. The data was copied as
a file copy and was contained in 38 files in 3 directories.
This was done by moving the ram drive icon into the A:
drive open window.
Phase 3 - Copy this data back to empty ram disk. This phase tests
the reading of data from the diskette. Same technique as
phase 2 was followed.
In all phases for each diskette, diskette motor was NOT on at
beginning of transfer. A stop watch was in left hand and mouse
was in right hand hand. Max delay 1 second. All times are
in minutes:seconds.
Interleave Write Time Read Time
1 4:43 1:28
2 6:31 2:14
3 5:55 1:55
4 5:21 1:41
5 5:29 1:43
6 4:50 1:26
7 4:44 1:27
8 4:43 1:27
9 4:43 1:28
Atari 4:43 1:27
OSS Format 4:56 1:23
These times could vary from time to time based on the particular
drive used but I think they would remain proportional.
Also any shell replacing the GEM desktop would probably speed up
transfer. I would be interested to know if anyone has used a shell
that would accomplish this. Please feel free to harrass or comment
as any discussion is informative.
George Feamster
Compuserve: 70105,771
Genie: BRANDON.AVE
1017 Brandon Ave.
Norfolk, Va 23507
Atari is a trademark of the people who make our computer.
OSS is a trademark of the people who make that popular PASCAL compiler.