5 inch floppies
Michael D. Setzer II
mikes at kuentos.guam.net
Mon Sep 5 12:02:29 UTC 2005
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On 5 Sep 2005 at 12:59, Amichai Rotman wrote:
>
> Just to answer the "why it reads directories and not the data?" - the directory structure is on track
> 0, sector 19 (and has a backup somewhere). it contains only pointers to the first track / sector
> where the respective file is.
>
5 1/4 inch diskettes had either 8, 9, or 15 sectors, and were single or
double sided.
160K 1 side 8 sectors / track 40 tracks
180K 1 side 9 sectors / track 40 tracks
320K 2 sides 8 sectors / track 40 tracks
360K 2 sides 9 sectors / track 40 tracks
1.2M 2 sides 15 sectors/ track 80 tracks
I recall one format of the older 8" diskettes that had 26 sectors, but
don't recall any more specifics.
This link has some info, but didn't notice a break down of the sectors
beyond the boot sector, and then there are two copies of the FAT.
http://alumnus.caltech.edu/~pje/dosfiles.html
I recall using these floppies on my 1983 HeathKit computer.
+----------------------------------------------------------+
Michael D. Setzer II - Computer Science Instructor
Guam Community College Computer Center
mailto:mikes at kuentos.guam.net
mailto:msetzerii at gmail.com
http://www.guam.net/home/mikes
Guam - Where America's Day Begins
+----------------------------------------------------------+
http://setiathome.berkeley.edu
Number of Seti Units Returned: 17,594
Processing time: 31 years, 263 days, 23 hours, 41 minutes
(Total Hours: 277,896)
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