5.25" (MS-)DOS disk dumping

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snc
Posts: 12
Joined: Mon Jun 04, 2012 1:18 pm

5.25" (MS-)DOS disk dumping

Post by snc »

I've got some trouble dumping 5,25" MS-DOS disks. I've put them in the drive in a machine, I can boot from them, and the contents read without problems. So, I went to dump those with Kryoflux, with the following result: every other sector dumps just fine, i.e. 0 is good, 1 bad, 2 good, 3 bad, and so forth. This happens with the whole set.

This is the command used: dtc -ftrack -i0 -i4
However, I've toyed with sector sizes, track distances, etc. to no avail. I must be wrong here somewhere... help?

Example:

Code: Select all

00.0    : frev: 44977, drift: 0.208 us, tfer: 248151 B/s, rpm: 360.180
00.0    : base: 2.002 us [99.962%], band: 4.001 us, 6.005 us, 8.001 us
00.0    : MFM: OK*, trk: 000, sec: 9, *H +9
00.1    : frev: 43051, drift: 0.791 us, tfer: 240852 B/s, rpm: 360.170
00.1    : base: 2.002 us [99.897%], band: 3.997 us, 6.005 us, 8.011 us
00.1    : MFM: OK*, trk: 000, sec: 9, *H +9
01.0    : frev: 55778, drift: 0.062 us, tfer: 310483 B/s, rpm: 360.168
01.0    : base: 0.981 us [64.590%], band: 1.576 us, 2.942 us, 4.088 us
01.0    : MFM: <unformatted>
01.1    : frev: 59539, drift: 0.062 us, tfer: 335614 B/s, rpm: 360.167
01.1    : base: 1.021 us [61.540%], band: 1.501 us, 3.064 us, 4.295 us
01.1    : MFM: <unformatted>
02.0    : frev: 39470, drift: 0.062 us, tfer: 219838 B/s, rpm: 360.170
02.0    : base: 2.002 us [99.860%], band: 3.987 us, 6.005 us, 8.007 us
02.0    : MFM: OK*, trk: 002[001], sec: 9, *HT +9
02.1    : frev: 39534, drift: 0.208 us, tfer: 219838 B/s, rpm: 360.162
02.1    : base: 2.002 us [99.773%], band: 3.985 us, 6.006 us, 8.019 us
02.1    : MFM: OK*, trk: 002[001], sec: 9, *T +9
03.0    : frev: 56977, drift: 0.104 us, tfer: 316483 B/s, rpm: 360.159
03.0    : base: 1.134 us [54.906%], band: 1.324 us, 2.267 us, 3.321 us
03.0    : MFM: <unformatted>
03.1    : frev: 61055, drift: 6.139 us, tfer: 341208 B/s, rpm: 360.158
03.1    : base: 0.964 us [62.312%], band: 1.461 us, 2.891 us, 4.195 us
03.1    : MFM: <unformatted>
04.0    : frev: 39292, drift: 0.125 us, tfer: 218859 B/s, rpm: 360.152
04.0    : base: 2.002 us [99.832%], band: 3.986 us, 6.006 us, 8.011 us
04.0    : MFM: OK*, trk: 004[002], sec: 9, *HT +9
04.1    : frev: 39508, drift: 0.146 us, tfer: 219838 B/s, rpm: 360.150
04.1    : base: 2.003 us [99.735%], band: 3.980 us, 6.008 us, 8.020 us
04.1    : MFM: OK*, trk: 004[002], sec: 9, *T +9
05.0    : frev: 57222, drift: 0.062 us, tfer: 318019 B/s, rpm: 360.156
05.0    : base: 1.590 us [49.466%], band: 1.502 us, 3.179 us, 5.101 us
05.0    : MFM: <unformatted>
05.1    : frev: 58761, drift: 0.541 us, tfer: 330868 B/s, rpm: 360.156
05.1    : base: 1.039 us [59.263%], band: 1.502 us, 3.117 us, 4.401 us
05.1    : MFM: <unformatted>
Last edited by snc on Thu Jun 14, 2012 4:59 pm, edited 1 time in total.

TeaRex
Posts: 120
Joined: Tue Nov 30, 2010 5:36 am

Re: 5,25" (MS-)DOS disk dumping

Post by TeaRex »

For 360 KB disks, add -k2 to your command line.
For 1200 KB disks, add -v360 instead.

snc
Posts: 12
Joined: Mon Jun 04, 2012 1:18 pm

Re: 5.25" (MS-)DOS disk dumping

Post by snc »

Thanks! I was obviously too tired yesterday... Most of my attempts failed with the GUI, and then i had mixed -k2 with some other switches - bad idea.

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