"The Hard Disk You've Been Waiting For"
cclist at sydex.com
Tue Apr 27 14:49:04 CDT 2010
On 27 Apr 2010 at 20:53, Steve Maddison wrote:
> It would be interesting, but I'd guess the average file size at the
> time that disk came out was significantly more then ten bytes!
Consider the time and the target audience (S100 users). Most
probably running some flavor of CP/M. So you're dealing with a
"flat" file system with a fixed number of directory slots (512 was
common for hard disks; a large file was broken into "extents", with
each extent occupying its own slot). So there was a finite limit to
the number of files that could be placed on such a device.
I seem to recall also that the official CP/M volume size lmitation
was somewhere around 8 MB. Not as restrictive as, say, the Apple II
scheme of making a (IMI?) hard disk look like 50 floppies, but there
are limits. I recall getting in an SA4000-series 14" drive with 40MB
on it and having to modify the BIOS to partition it into several CP/M
At about the same time we were deploying 7 and 14 MB Rodime 5.25"
drives, I remember that we received a sample drive from Evotek that
was something like 50MB (had a plexiglas HDA cover, so that was kind
of cool to watch). I don't think I ever saw that drive sold. I
stilll have the documentation somewhere.
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