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it sounds like he's trying to use a high density drive to image double density floppies, which isn't a great idea. far better to use the double density drive wh
by tubetime 8y ago
it sounds like he's trying to use a high density drive to image double density floppies, which isn't a great idea. far better to use the double density drive which has the correspondingly large read/write head so you get a better signal/noise ratio.
- PavlikPaja 8y agoIt's a common myth that you can get less noise from bigger pixels. Smaller pixels only allow you to see more of it, as you can see higher frequency noise that you wouldn't see with the bigger pixels, but the SNR shouldn't be any worse.
- Dylan16807 8y ago> It's a common myth that you can get less noise from bigger pixels. In general yes. Though having the wrong size read head gets in the way of doing perfect subpixel alignment. But you're missing the critical issue with "double stepping". The head is reading half the width of each track, and then skipping all the way to the next track. It's not making two side-by-side reads on each track and combining the data. So if there's a small magnetic issue, it can corrupt bits that would otherwise be fine.
- tom_ 8y agoI’m pretty sure that issue is a question of 40 tracks vs 80 tracks, rather thsn the density.
- snvzz 8y agoThe track format[0] of OS/2 is quite special. [0] https://en.wikipedia.org/wiki/IBM_Extended_Density_Format https://en.wikipedia.org/wiki/IBM_Extended_Density_Format