Copying a 1.44M MFM disk, only 720k saved

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tomasparks
Posts: 4
Joined: Sun Nov 27, 2016 9:25 pm

Copying a 1.44M MFM disk, only 720k saved

Post by tomasparks » Fri Mar 09, 2018 2:36 am

I am trying to copy my PC floppy disk (MFM 1.44Mbytes), but only 720kbytes are being saved in disk image

Code: Select all

dtc -i4 -ffilename.img
I had it work before I turned off the computer the day before :oops:

ZrX
Posts: 483
Joined: Tue Dec 06, 2011 9:09 pm

Re: Copying a 1.44M MFM disk, only 720k saved

Post by ZrX » Fri Mar 09, 2018 12:56 pm

dtc -fname.img -i4

tomasparks
Posts: 4
Joined: Sun Nov 27, 2016 9:25 pm

Re: Copying a 1.44M MFM disk, only 720k saved

Post by tomasparks » Sat Mar 10, 2018 5:54 am

no luck
I getting lots of
  • MFM <error>
  • MFM <mismatach>
  • MFM <unformated>
on the same disk that was copied successfully (1440Kbytes)

I am starting to think the drive may dirty

User avatar
Modeler
Posts: 20
Joined: Sun Feb 04, 2018 9:49 pm

Re: Copying a 1.44M MFM disk, only 720k saved

Post by Modeler » Tue Apr 03, 2018 12:18 pm

Are the errors all against the same side of the disk? If so, that would be consistent with one of the heads being dirty / out of action. If only half of the sectors can be identified, then I guess a 720 KB image is all you'll get.

tomasparks
Posts: 4
Joined: Sun Nov 27, 2016 9:25 pm

Re: Copying a 1.44M MFM disk, only 720k saved

Post by tomasparks » Sat Apr 07, 2018 2:27 pm

was able find another floppy drive and was successful in save the disk images :)

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