12 Jun
2026
12 Jun
'26
8:46 a.m.
IIRC, the trs-80 had two allocation units per track, 5 sectors each. One
option some add-on or alternative operating system offered was to make each
track 1 or 2 long records, increasing capacity by 25%? 50%?
was this done in any other operating systems/computers?
On Thu, Jun 11, 2026 at 2:46 PM Ethan Dicks via cctalk <
cctalk(a)classiccmp.org> wrote:
On Thu, Jun 11, 2026 at 3:31 PM Tom Gardner via cctalk
<cctalk(a)classiccmp.org> wrote:
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“Then 3.5"
The Epson PF10 had 40 cylinders with 67.5 tracks per inch, but
everybody else immediately went to 135 tpi, …”
• The first 3½-inch is generally accepted as the Sony OA-D30V shipping in
1981 at 135 tpi. There were earlier drives smaller than the 5¼-inch.
The
Epson PF-10 was much later circa, 1984