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 < [email protected]> wrote: > On Thu, Jun 11, 2026 at 3:31 PM Tom Gardner via cctalk > <[email protected]> wrote: > > “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 > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
