Am 19. Juni 2026 14:52:50 schrieb Francesco Messineo <francesco.messineo_at_gmail.com>: > On Fri, Jun 19, 2026 at 2:45 PM André Fachat <afachat_at_gmx.de> wrote: >> >> >> Correct. The only difference is that due to the smaller tracks the bits on >> the media get smaller two. Eventually reaching a point where the quality of >> the material (e.g granularity of the magnetic material) makes it unreliable. > > it's not the material, it's the head's pole gap that are too large. > 100 tpi heads (or 96 tpi ones, they're identical) have a much smaller > magnetic gap. So with even higher clock rates, 8x50/SFD-1001 drives > can format 29 to 23 sectors on the same magnetic media, and I've read > without errors disks written in 1986 with the SFD-1001. The gap may be smaller but not much. It's the bit frequency that matters for blocks per track, not the track density (tpi). The Commodore 100tpi drives only increased the bit frequency by 50%, from 250kHz to 375kHz. https://extrapages.de/archives/20190102-Floppy-notes.html André > > IZ8DWF >>Received on 2026-06-19 15:00:52
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