Search found 219 matches

by brightcaster
Sat Nov 09, 2019 10:16 am
Forum: General
Topic: Need advice on how to recover 5.25" floppy
Replies: 52
Views: 3053

Re: Need advice on how to recover 5.25" floppy

Image format is almost the same as d64! Both is basically a sector-for-sector copy of a disk... 683 sectors of 256 byte resulting in 174848 byte which is the length of a d64 file. 2880 sectors of 512 byte resulting in 1474 560 byte which is the lengt of a standard img file (1,44 MBdisk) There are no...
by brightcaster
Mon Nov 04, 2019 7:52 pm
Forum: General
Topic: Need advice on how to recover 5.25" floppy
Replies: 52
Views: 3053

Re: Need advice on how to recover 5.25" floppy

Whow, I just learned something new again! I always used the track distance parameter -k to read mfm 40 track dd disks. But I never recognized that this feature is not available for the gcr coded formats! I understand that the decision was made to avoid problems with fat/half-tracks etc... But wouldn...
by brightcaster
Mon Nov 04, 2019 1:30 pm
Forum: General
Topic: Need advice on how to recover 5.25" floppy
Replies: 52
Views: 3053

Re: Need advice on how to recover 5.25" floppy

Beside the 40/80 track issue the disk is very noisy from the start off but gets even more worse towards the inner tracks! That corresponds with the fact that the inner tracks are written with lower speed on a c1541 resulting in shorter fluxchanges when reading with todays drives using constant speed...
by brightcaster
Wed Oct 30, 2019 6:34 pm
Forum: General
Topic: Need advice on how to recover 5.25" floppy
Replies: 52
Views: 3053

Re: Need advice on how to recover 5.25" floppy

You have to adjust the "Track Distance" switch in the image profil settings. You are using a 40 track device but the kryflux is double stepping the tracks as if it is conected to a 80 track drive. That's why the orange T boxes apear indicating that the track number is not corresponding to what's exp...
by brightcaster
Wed Oct 30, 2019 6:16 pm
Forum: Support
Topic: Errors Attempting To Write Stream Files
Replies: 27
Views: 498

Re: Errors Attempting To Write Stream Files

Yes, that's really odd!

BTW, the last raw-image you posted contains some interesting mfm sectors on the last tracks beside the fact that the rest is all fm code. It looks as if thats the reason why it's not enough to copy the first 77 tracks to get working copies...

David
by brightcaster
Tue Oct 29, 2019 2:51 pm
Forum: Support
Topic: Errors Attempting To Write Stream Files
Replies: 27
Views: 498

Re: Errors Attempting To Write Stream Files

The DOS disk looks similar to the one before, presenting nothing but noise and hum... It may be nothing written on it, so that the drives AGC switches to maximum gain while trying to read the data from the surface thus bringing up noise and hum! Is the write protection jumper on the kryoflux in the ...
by brightcaster
Tue Oct 29, 2019 9:30 am
Forum: Support
Topic: Errors Attempting To Write Stream Files
Replies: 27
Views: 498

Re: Errors Attempting To Write Stream Files

Well, I still think that it's a mains hum problem. Could it be an earth or ground loop? Is it possible to connect the drive with an external power supply that has no ground connection? You can get similiar vizualisation as ZRX showed in his posting with the track analyzer of the HxC tool: https://hx...
by brightcaster
Mon Oct 28, 2019 10:00 pm
Forum: Support
Topic: Errors Attempting To Write Stream Files
Replies: 27
Views: 498

Re: Errors Attempting To Write Stream Files

Did you place the drive directly in front of a crt monitor while reading the disk? I know that crt monitors became quiet rare during the last years, but if you have the waveterm on the desktop? I don't know what the framerate of the monitor in the waveterm is, but PAL used 50 Hz and NTSC 60 Hz for e...
by brightcaster
Mon Oct 28, 2019 9:12 pm
Forum: Support
Topic: Drives confirmed working with KryoFlux
Replies: 231
Views: 129953

Re: Drives confirmed working with KryoFlux

A 40track drive like the TEAC FD-55-A can't read halftracks which have often been used for copyprotection. (The commodore drives like the 1541 could adress 80 tracks!)

David
by brightcaster
Mon Oct 28, 2019 9:02 pm
Forum: Support
Topic: Errors Attempting To Write Stream Files
Replies: 27
Views: 498

Re: Errors Attempting To Write Stream Files

Oh yes now I can see;-) I missinterpreted the dark lines as some kind of remaining sector gaps, but they are not actually! But this nice picture leeds me to a weird idea: Could it be that the disks was exposed to a strong magnetic mains field while spinning? Could either be 50Hz at 300rpm or 60Hz at...