[Coco] Using that 16/32/64 MB RamDrive.
gene.heskett at verizon.net
Fri Feb 6 06:55:01 EST 2004
On Friday 06 February 2004 00:11, Theodore Evans wrote:
>On Feb 5, 2004, at 6:42 PM, Gene Heskett wrote:
>> On Thursday 05 February 2004 23:28, Paul T. Barton wrote:
>>> Gee, I don't know. I'll try and dsave
>>> my biggest partition to /r0 and see.
>>> Formatting is really a pain. For now
>>> I have 15.9MB and formatting counts
>>> from $000 to $3DF. iIt takes about
>>> 3-4 minutes. The actual dsave-copy is
>>> pretty fast.
>>> I wish that I had another version of FORMAT
>>> just for this ramdrive that wouldn't print
>>> the sector #'s and "run faster".
>> Can you set it for logical only, with no verify? Unless its
>> verifying, which is where the sectors get counted up, a logical
>> format should only take a few milliseconds. It only has to
>> compose and write 3 sectors to do that, LSN0 for the usual
>> reasons, LSN1 for the fat, and LSN2 for the first sector of the
>> root directory. Everything else gets written as needed anyway.
>A 16 MB drive would have 64k 256 byte sectors which would require an
>allocation map (it isn't a FAT as is only indicates which sectors
> are allocated, not how they are structured as files like the chains
> in MS-DOS/Windows) of 8k bytes or 32 sectors, so even a logical
> format of a drive this size would require writing 34 sectors.
> Still mighty fast. Even a drive as small as a 720k floppy requires
> more than a single sector for the allocation map.
All true of course. And myram does extend the fat to fit the size its
set for via the cyl= in dmode, so if set for 1.5 megs, it does have
to write a few more sectors of zeroed fat before it can write the
root dir's first sector and LSN0. But thats still so quick, less
than 200 milliseconds, that its a never mind... Megaread times on a
nitros9 machine are a slightly fat 11 seconds, same as for a scsi
disk since the transfer time is set by the coco's PIO(0) effective
mode. If the i/o mechanism were extended to use the other, nocan
mode of switching pages, I doubt if the slowdown would be all that
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Copyright 2004 by Maurice Eugene Heskett, all rights reserved.
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