Kryoflux/DTC can not read good sectors

[SomeGuy]

Just wondering what is going on here. I have a pair of disks with the exact same problem. Both disks read perfectly on real hardware even using the same drive, and the Kryoflux stream files even decode fine using the PCE tools. These are not copy protected, and are standard 320K (8 sector DS) disks. The disks are also in good physical condition.

But when reading/decoding the disks with Kryoflux or the DTC tool, it is unable to read a number of sectors towards the end of the disk.

If anyone cares to take a closer look, I've posted one of the disk images here:
http://s000.tinyupload.com/index.php?fi ... 1661112918

sample DTC log:

Code: Select all

dtc -m1 -fcorstar2\track -i0 -oe39 -ftest.img -i4 -e39

KryoFlux DiskTool Console, v2.51_Win32, uiv.1, Oct 29 2014, 16:45:42
(c) 2009-2014 KryoFlux Products & Services Ltd.
Developed by The Software Preservation Society, www.softpres.org
Licensed for private, non-commercial use only.

Stream file: corstar2\track

00.0    : frev: 38944, drift: 0.050 us, tfer: 186466 B/s, rpm: 300.239
00.0    : base: 1.993 us [99.444%], band: 3.977 us, 5.978 us, 7.945 us
00.0    : MFM: OK, trk: 000, sec: 8
00.1    : frev: 39068, drift: 0.549 us, tfer: 187944 B/s, rpm: 300.240
00.1    : base: 1.994 us [99.675%], band: 3.974 us, 5.982 us, 7.985 us
00.1    : MFM: OK, trk: 000, sec: 8
01.0    : frev: 39591, drift: 0.433 us, tfer: 189523 B/s, rpm: 300.238
01.0    : base: 1.997 us [99.898%], band: 3.992 us, 5.992 us, 8.003 us
01.0    : MFM: OK, trk: 001, sec: 8
01.1    : frev: 39692, drift: 0.508 us, tfer: 191076 B/s, rpm: 300.241
01.1    : base: 2.002 us [99.866%], band: 3.994 us, 6.005 us, 8.013 us
01.1    : MFM: OK, trk: 001, sec: 8
02.0    : frev: 39494, drift: 0.658 us, tfer: 189158 B/s, rpm: 300.240
02.0    : base: 1.999 us [99.904%], band: 3.994 us, 5.996 us, 8.007 us
02.0    : MFM: OK, trk: 002, sec: 8
02.1    : frev: 39650, drift: 0.666 us, tfer: 190758 B/s, rpm: 300.239
02.1    : base: 1.999 us [99.833%], band: 3.987 us, 5.998 us, 7.986 us
02.1    : MFM: OK, trk: 002, sec: 8
03.0    : frev: 39386, drift: 0.325 us, tfer: 188614 B/s, rpm: 300.239
03.0    : base: 1.998 us [99.910%], band: 3.991 us, 5.995 us, 7.998 us
03.0    : MFM: OK, trk: 003, sec: 8
03.1    : frev: 39371, drift: 0.941 us, tfer: 189497 B/s, rpm: 300.243
03.1    : base: 2.001 us [99.853%], band: 3.985 us, 6.002 us, 7.991 us
03.1    : MFM: OK, trk: 003, sec: 8
04.0    : frev: 39414, drift: 0.158 us, tfer: 188795 B/s, rpm: 300.241
04.0    : base: 2.001 us [99.923%], band: 3.994 us, 6.003 us, 8.005 us
04.0    : MFM: OK, trk: 004, sec: 8
04.1    : frev: 39486, drift: 0.874 us, tfer: 189968 B/s, rpm: 300.241
04.1    : base: 2.000 us [99.897%], band: 3.988 us, 6.000 us, 8.006 us
04.1    : MFM: OK, trk: 004, sec: 8
05.0    : frev: 39553, drift: 0.325 us, tfer: 189341 B/s, rpm: 300.242
05.0    : base: 2.002 us [99.815%], band: 3.993 us, 6.005 us, 8.022 us
05.0    : MFM: OK, trk: 005, sec: 8
05.1    : frev: 39486, drift: 0.474 us, tfer: 189968 B/s, rpm: 300.242
05.1    : base: 2.002 us [99.816%], band: 3.991 us, 6.006 us, 8.018 us
05.1    : MFM: OK, trk: 005, sec: 8
06.0    : frev: 39540, drift: 0.499 us, tfer: 189341 B/s, rpm: 300.242
06.0    : base: 1.999 us [99.885%], band: 3.992 us, 5.996 us, 8.009 us
06.0    : MFM: OK, trk: 006, sec: 8
06.1    : frev: 39438, drift: 0.566 us, tfer: 189811 B/s, rpm: 300.242
06.1    : base: 2.003 us [99.871%], band: 3.988 us, 6.009 us, 8.002 us
06.1    : MFM: OK, trk: 006, sec: 8
07.0    : frev: 39623, drift: 0.175 us, tfer: 189706 B/s, rpm: 300.242
07.0    : base: 2.003 us [99.904%], band: 3.995 us, 6.009 us, 8.003 us
07.0    : MFM: OK, trk: 007, sec: 8
07.1    : frev: 39526, drift: 0.300 us, tfer: 190126 B/s, rpm: 300.242
07.1    : base: 2.000 us [99.854%], band: 3.991 us, 5.999 us, 8.017 us
07.1    : MFM: OK, trk: 007, sec: 8
08.0    : frev: 39514, drift: 0.724 us, tfer: 189158 B/s, rpm: 300.242
08.0    : base: 2.003 us [99.855%], band: 3.995 us, 6.010 us, 8.011 us
08.0    : MFM: OK, trk: 008, sec: 8
08.1    : frev: 39597, drift: 0.891 us, tfer: 190441 B/s, rpm: 300.244
08.1    : base: 2.004 us [99.724%], band: 3.994 us, 6.013 us, 8.030 us
08.1    : MFM: OK, trk: 008, sec: 8
09.0    : frev: 39486, drift: 0.042 us, tfer: 189158 B/s, rpm: 300.242
09.0    : base: 2.003 us [99.804%], band: 3.996 us, 6.008 us, 8.024 us
09.0    : MFM: OK, trk: 009, sec: 8
09.1    : frev: 39654, drift: 0.566 us, tfer: 190758 B/s, rpm: 300.242
09.1    : base: 2.003 us [99.781%], band: 3.995 us, 6.009 us, 8.026 us
09.1    : MFM: OK, trk: 009, sec: 8
10.0    : frev: 39610, drift: 0.083 us, tfer: 189706 B/s, rpm: 300.242
10.0    : base: 2.002 us [99.802%], band: 3.997 us, 6.007 us, 8.026 us
10.0    : MFM: OK, trk: 010, sec: 8
10.1    : frev: 39536, drift: 0.150 us, tfer: 190283 B/s, rpm: 300.242
10.1    : base: 2.003 us [99.815%], band: 3.994 us, 6.008 us, 8.019 us
10.1    : MFM: OK, trk: 010, sec: 8
11.0    : frev: 39750, drift: 0.308 us, tfer: 190257 B/s, rpm: 300.242
11.0    : base: 2.002 us [99.815%], band: 3.996 us, 6.005 us, 8.025 us
11.0    : MFM: OK, trk: 011, sec: 8
11.1    : frev: 39545, drift: 0.308 us, tfer: 190283 B/s, rpm: 300.243
11.1    : base: 2.004 us [99.814%], band: 3.995 us, 6.013 us, 8.016 us
11.1    : MFM: OK, trk: 011, sec: 8
12.0    : frev: 39353, drift: 0.874 us, tfer: 188433 B/s, rpm: 300.243
12.0    : base: 2.002 us [99.891%], band: 3.996 us, 6.006 us, 8.010 us
12.0    : MFM: OK, trk: 012, sec: 8
12.1    : frev: 39552, drift: 0.117 us, tfer: 190283 B/s, rpm: 300.242
12.1    : base: 2.003 us [99.725%], band: 3.995 us, 6.010 us, 8.035 us
12.1    : MFM: OK, trk: 012, sec: 8
13.0    : frev: 39456, drift: 0.166 us, tfer: 188976 B/s, rpm: 300.242
13.0    : base: 2.003 us [99.794%], band: 3.997 us, 6.008 us, 8.026 us
13.0    : MFM: OK, trk: 013, sec: 8
13.1    : frev: 39714, drift: 0.649 us, tfer: 191076 B/s, rpm: 300.243
13.1    : base: 2.005 us [99.609%], band: 3.995 us, 6.015 us, 8.051 us
13.1    : MFM: OK, trk: 013, sec: 8
14.0    : frev: 39588, drift: 0.466 us, tfer: 189523 B/s, rpm: 300.243
14.0    : base: 2.003 us [99.805%], band: 3.997 us, 6.008 us, 8.024 us
14.0    : MFM: OK, trk: 014, sec: 8
14.1    : frev: 39594, drift: 0.291 us, tfer: 190600 B/s, rpm: 300.242
14.1    : base: 2.005 us [99.821%], band: 3.991 us, 6.014 us, 8.010 us
14.1    : MFM: OK, trk: 014, sec: 8
15.0    : frev: 39452, drift: 0.491 us, tfer: 188976 B/s, rpm: 300.240
15.0    : base: 2.003 us [99.840%], band: 3.993 us, 6.008 us, 8.014 us
15.0    : MFM: OK, trk: 015, sec: 8
15.1    : frev: 39514, drift: 0.807 us, tfer: 190126 B/s, rpm: 300.243
15.1    : base: 2.003 us [99.847%], band: 3.986 us, 6.008 us, 7.995 us
15.1    : MFM: OK, trk: 015, sec: 8
16.0    : frev: 39612, drift: 0.083 us, tfer: 189706 B/s, rpm: 300.241
16.0    : base: 1.999 us [99.777%], band: 3.991 us, 5.998 us, 8.029 us
16.0    : MFM: OK, trk: 016, sec: 8
16.1    : frev: 39445, drift: 0.408 us, tfer: 189811 B/s, rpm: 300.242
16.1    : base: 2.005 us [99.867%], band: 3.995 us, 6.016 us, 8.003 us
16.1    : MFM: OK, trk: 016, sec: 8
17.0    : frev: 39546, drift: 0.566 us, tfer: 189341 B/s, rpm: 300.241
17.0    : base: 2.003 us [99.845%], band: 3.993 us, 6.010 us, 7.989 us
17.0    : MFM: OK, trk: 017, sec: 8
17.1    : frev: 39580, drift: 0.982 us, tfer: 190441 B/s, rpm: 300.241
17.1    : base: 2.005 us [99.729%], band: 3.993 us, 6.014 us, 8.028 us
17.1    : MFM: OK, trk: 017, sec: 8
18.0    : frev: 39596, drift: 0.591 us, tfer: 189706 B/s, rpm: 300.241
18.0    : base: 2.003 us [99.836%], band: 3.995 us, 6.009 us, 8.016 us
18.0    : MFM: OK, trk: 018, sec: 8
18.1    : frev: 39374, drift: 0.108 us, tfer: 189497 B/s, rpm: 300.242
18.1    : base: 2.004 us [99.801%], band: 3.993 us, 6.013 us, 8.016 us
18.1    : MFM: OK, trk: 018, sec: 8
19.0    : frev: 39445, drift: 0.699 us, tfer: 188976 B/s, rpm: 300.243
19.0    : base: 2.004 us [99.824%], band: 3.996 us, 6.012 us, 8.016 us
19.0    : MFM: OK, trk: 019, sec: 8
19.1    : frev: 39280, drift: 0.133 us, tfer: 189028 B/s, rpm: 300.243
19.1    : base: 2.006 us [99.861%], band: 3.994 us, 6.019 us, 8.000 us
19.1    : MFM: OK, trk: 019, sec: 8
20.0    : frev: 39476, drift: 0.508 us, tfer: 188976 B/s, rpm: 300.242
20.0    : base: 2.003 us [99.880%], band: 3.989 us, 6.008 us, 8.003 us
20.0    : MFM: OK, trk: 020, sec: 8
20.1    : frev: 39326, drift: 0.549 us, tfer: 189184 B/s, rpm: 300.242
20.1    : base: 2.004 us [99.731%], band: 3.983 us, 6.011 us, 8.021 us
20.1    : MFM: OK, trk: 020, sec: 8
21.0    : frev: 39396, drift: 2.114 us, tfer: 188795 B/s, rpm: 300.241
21.0    : base: 2.002 us [99.798%], band: 3.988 us, 6.005 us, 8.019 us
21.0    : MFM: OK, trk: 021, sec: 8
21.1    : frev: 39516, drift: 0.583 us, tfer: 190126 B/s, rpm: 300.242
21.1    : base: 2.005 us [99.776%], band: 3.984 us, 6.014 us, 8.010 us
21.1    : MFM: OK, trk: 021, sec: 8
22.0    : frev: 39586, drift: 0.533 us, tfer: 189523 B/s, rpm: 300.240
22.0    : base: 2.006 us [99.818%], band: 3.994 us, 6.018 us, 7.991 us
22.0    : MFM: OK, trk: 022, sec: 8
22.1    : frev: 39624, drift: 0.117 us, tfer: 190758 B/s, rpm: 300.243
22.1    : base: 2.006 us [99.810%], band: 3.987 us, 6.017 us, 8.004 us
22.1    : MFM: OK, trk: 022, sec: 8
23.0    : frev: 39868, drift: 0.291 us, tfer: 190811 B/s, rpm: 300.240
23.0    : base: 2.004 us [99.826%], band: 3.992 us, 6.012 us, 8.012 us
23.0    : MFM: OK, trk: 023, sec: 8
23.1    : frev: 39790, drift: 0.075 us, tfer: 191555 B/s, rpm: 300.243
23.1    : base: 2.007 us [99.758%], band: 3.983 us, 6.020 us, 8.006 us
23.1    : MFM: OK, trk: 023, sec: 8
24.0    : frev: 39762, drift: 0.583 us, tfer: 190441 B/s, rpm: 300.241
24.0    : base: 2.002 us [99.842%], band: 3.992 us, 6.007 us, 8.014 us
24.0    : MFM: OK, trk: 024, sec: 8
24.1    : frev: 39411, drift: 0.225 us, tfer: 189654 B/s, rpm: 300.241
24.1    : base: 2.008 us [99.778%], band: 3.983 us, 6.023 us, 8.001 us
24.1    : MFM: OK, trk: 024, sec: 8
25.0    : frev: 39374, drift: 0.092 us, tfer: 188614 B/s, rpm: 300.242
25.0    : base: 2.005 us [99.650%], band: 3.990 us, 6.015 us, 8.038 us
25.0    : MFM: OK, trk: 025, sec: 8
25.1    : frev: 39542, drift: 0.133 us, tfer: 190283 B/s, rpm: 300.242
25.1    : base: 2.007 us [99.670%], band: 3.984 us, 6.020 us, 8.023 us
25.1    : MFM: OK, trk: 025, sec: 8
26.0    : frev: 39628, drift: 0.899 us, tfer: 189706 B/s, rpm: 300.241
26.0    : base: 2.002 us [99.817%], band: 3.983 us, 6.005 us, 7.989 us
26.0    : MFM: OK, trk: 026, sec: 8
26.1    : frev: 39686, drift: 0.108 us, tfer: 190917 B/s, rpm: 300.242
26.1    : base: 2.007 us [99.768%], band: 3.979 us, 6.020 us, 7.999 us
26.1    : MFM: OK, trk: 026, sec: 8
27.0    : frev: 39634, drift: 0.624 us, tfer: 189889 B/s, rpm: 300.241
27.0    : base: 2.001 us [99.727%], band: 3.976 us, 6.004 us, 7.980 us
27.0    : MFM: OK, trk: 027, sec: 8
27.1    : frev: 39647, drift: 0.142 us, tfer: 190758 B/s, rpm: 300.243
27.1    : base: 2.003 us [99.753%], band: 3.974 us, 6.009 us, 8.009 us
27.1    : MFM: OK, trk: 027, sec: 8
28.0    : frev: 39662, drift: 0.158 us, tfer: 189889 B/s, rpm: 300.242
28.0    : base: 2.000 us [99.836%], band: 3.976 us, 6.000 us, 8.005 us
28.0    : MFM: OK, trk: 028, sec: 8
28.1    : frev: 39508, drift: 0.266 us, tfer: 190126 B/s, rpm: 300.242
28.1    : base: 2.004 us [99.729%], band: 3.973 us, 6.011 us, 7.989 us
28.1    : MFM: OK, trk: 028, sec: 8
29.0    : frev: 39706, drift: 0.433 us, tfer: 190073 B/s, rpm: 300.244
29.0    : base: 2.000 us [99.738%], band: 3.978 us, 6.001 us, 7.976 us
29.0    : MFM: OK, trk: 029, sec: 8
29.1    : frev: 39874, drift: 0.300 us, tfer: 191876 B/s, rpm: 300.243
29.1    : base: 2.002 us [99.742%], band: 3.972 us, 6.006 us, 8.012 us
29.1    : MFM: OK, trk: 029, sec: 8
30.0    : frev: 39964, drift: 0.050 us, tfer: 191369 B/s, rpm: 300.242
30.0    : base: 2.001 us [99.776%], band: 3.975 us, 6.004 us, 8.011 us
30.0    : MFM: OK, trk: 030, sec: 8
30.1    : frev: 39793, drift: 0.491 us, tfer: 191395 B/s, rpm: 300.241
30.1    : base: 2.005 us [99.688%], band: 3.969 us, 6.016 us, 8.009 us
30.1    : MFM: OK, trk: 030, sec: 8
31.0    : frev: 39792, drift: 0.799 us, tfer: 190626 B/s, rpm: 300.243
31.0    : base: 2.003 us [99.709%], band: 3.976 us, 6.009 us, 8.020 us
31.0    : MFM: OK, trk: 031, sec: 8
31.1    : frev: 39842, drift: 0.574 us, tfer: 191715 B/s, rpm: 300.243
31.1    : base: 2.006 us [99.680%], band: 3.972 us, 6.019 us, 8.010 us
31.1    : MFM: OK, trk: 031, sec: 8
32.0    : frev: 40096, drift: 0.092 us, tfer: 192520 B/s, rpm: 300.242
32.0    : base: 2.004 us [99.652%], band: 3.979 us, 6.013 us, 8.028 us
32.0    : MFM: OK, trk: 032, sec: 8
32.1    : frev: 40207, drift: 0.092 us, tfer: 193495 B/s, rpm: 300.242
32.1    : base: 2.008 us [99.501%], band: 3.976 us, 6.023 us, 8.043 us
32.1    : MFM: OK, trk: 032, sec: 8
33.0    : frev: 40060, drift: 0.058 us, tfer: 192359 B/s, rpm: 300.241
33.0    : base: 2.003 us [99.681%], band: 3.979 us, 6.009 us, 8.028 us
33.0    : MFM: OK, trk: 033, sec: 8
33.1    : frev: 40148, drift: 0.083 us, tfer: 193169 B/s, rpm: 300.241
33.1    : base: 2.008 us [99.703%], band: 3.976 us, 6.025 us, 7.995 us
33.1    : MFM: OK, trk: 033, sec: 8
34.0    : frev: 40100, drift: 0.508 us, tfer: 192520 B/s, rpm: 300.240
34.0    : base: 2.004 us [99.747%], band: 3.979 us, 6.012 us, 8.012 us
34.0    : MFM: OK, trk: 034, sec: 8
34.1    : frev: 40028, drift: 0.117 us, tfer: 192682 B/s, rpm: 300.242
34.1    : base: 2.009 us [99.639%], band: 3.974 us, 6.026 us, 8.013 us
34.1    : MFM: OK, trk: 034, sec: 8
35.0    : frev: 40051, drift: 0.316 us, tfer: 192359 B/s, rpm: 300.242
35.0    : base: 2.004 us [99.698%], band: 3.976 us, 6.013 us, 8.018 us
35.0    : MFM: OK, trk: 035, sec: 8
35.1    : frev: 39892, drift: 0.533 us, tfer: 192036 B/s, rpm: 300.241
35.1    : base: 2.012 us [99.531%], band: 3.970 us, 6.035 us, 8.020 us
35.1    : MFM: OK, trk: 035, sec: 8
36.0    : frev: 40048, drift: 0.674 us, tfer: 192359 B/s, rpm: 300.243
36.0    : base: 2.004 us [99.640%], band: 3.973 us, 6.011 us, 8.028 us
36.0    : MFM: OK, trk: 036, sec: 8
36.1    : frev: 39780, drift: 0.541 us, tfer: 191395 B/s, rpm: 300.241
36.1    : base: 2.009 us [99.479%], band: 3.968 us, 6.027 us, 8.035 us
36.1    : MFM: <error>, trk: 036, sec: 8, bad: 1
37.0    : frev: 39710, drift: 0.033 us, tfer: 190073 B/s, rpm: 300.241
37.0    : base: 2.009 us [99.641%], band: 3.982 us, 6.028 us, 8.019 us
37.0    : MFM: OK, trk: 037, sec: 8
37.1    : frev: 39808, drift: 0.083 us, tfer: 191555 B/s, rpm: 300.241
37.1    : base: 2.015 us [99.471%], band: 3.978 us, 6.045 us, 8.028 us
37.1    : MFM: <error>, trk: 037, sec: 8, bad: 2
38.0    : frev: 39590, drift: 0.075 us, tfer: 189523 B/s, rpm: 300.241
38.0    : base: 2.011 us [99.524%], band: 3.983 us, 6.034 us, 8.034 us
38.0    : MFM: OK, trk: 038, sec: 8
38.1    : frev: 38840, drift: 0.874 us, tfer: 186872 B/s, rpm: 300.242
38.1    : base: 2.013 us [65.411%], band: 3.915 us, 6.040 us, 7.199 us?
38.1    : MFM: <error>, trk: 038, sec: 8, bad: 4
39.0    : frev: 37823, drift: 0.416 us, tfer: 181306 B/s, rpm: 300.241
39.0    : base: 2.010 us [98.690%], band: 3.893 us, 6.029 us, 8.100 us
39.0    : MFM: OK, trk: 039, sec: 8
39.1    : frev: 37792, drift: 0.133 us, tfer: 181139 B/s, rpm: 300.242
39.1    : base: 2.016 us [98.753%], band: 3.854 us, 6.049 us, 7.971 us
39.1    : MFM: <error>, trk: 039, sec: 8, bad: 4, *I

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36.1    : Bad sector found
36.1    : Read operation failed
37.1    : Bad sector found
37.1    : Read operation failed
38.1    : Bad sector found
38.1    : Read operation failed
39.1    : Bad sector found
39.1    : Read operation failed

[IFW]

The bad tracks look pretty bad actually, with quite some bleeding between the bands - ie flux reversals that may belong to either of 2 adjacent bands. Additionally, the peak shifts are quite bad too splitting the bands - looks like as if the precompensation was incorrect.
I have no idea why some tool wouldn't report this as incorrect or ambiguous, but it most definitely is...
Is this read with a HD drive?
If yes, I'd recommend trying to see if adding -dd0 or -dd1 makes a difference.

I've attached a scatter plot of one of the bad tracks showing how DTC sees it - take a closer look.

[SomeGuy]

I am reading this with a low-density (360K) drive. Unfortunately I don't have a 1.2mb drive handy to test with.

[ibmpc5150]

Hi.
To convert it correctly, you must run pfi.exe as follows.

pfi track.00.0.raw -p decode pri disk.pri
pri disk.pri -p decode mfm disk1.ima

[SomeGuy]

I finally got a chance to try these disks in a 1.2mb drive with the kryoflux. Same issue, those last couple tracks are not decodeable by the kryoflux / DTC (tested with the density line set both ways), however the PCE tools can decode the steam perfectly, and the disk reads OK when used with a real FDC.