Need advice on how to recover 5.25" floppy

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harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Tue Nov 05, 2019 12:28 pm

ZrX wrote:
Tue Nov 05, 2019 10:45 am
You'd need to space the tracks from 40 to 80.

track00.0.raw -> 00.0.raw
track01.0.raw -> 02.0.raw
track02.0.raw -> 04.0.raw
track03.0.raw -> 06.0.raw
track04.0.raw -> 08.0.raw
...

For side 1 tracks you'd have to start from track 8 (track00.1.raw -> 08.1.raw) and you'll lose the first four tracks as reading those requires the flippy modified drive.
ok, i tried to make a .bat file, this is the result: https://pastebin.com/9sTmFMDX
Regarding the side1, do i have to remove the last four tracks (highlited in yellow)?
SomeGuy wrote:
Tue Nov 05, 2019 12:04 pm
Most "360k" floppy drives have issues reading GCR encoding. Your best bet at reading them is probably a "1.2mb" Teac drive.

Of course, it is difficult to reliably write 48tpi (360k) images in a 96tpi (1.2mb) drive and KF does not support writing non-index aligned streams. But for reading and archiving, it is fine.
They are only about 10 disks and they are not so important, so it's not worth the effort to buy a new drive, i only want to do a quick dump with the hardware i have.
Probably the best thing would be sending them to someone who has proper hardware, but for now i want to try with my current hardware.

ZrX
Posts: 577
Joined: Tue Dec 06, 2011 9:09 pm

Re: Need advice on how to recover 5.25" floppy

Post by ZrX » Tue Nov 05, 2019 2:20 pm

Script is almost good, you're just trying to overwrite files with the same name there, so better use different target name than "track".

No need to delete the tracks past 83 as KF will ignore those anyway.

harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Tue Nov 05, 2019 3:11 pm

ZrX wrote:
Tue Nov 05, 2019 2:20 pm
Script is almost good, you're just trying to overwrite files with the same name there, so better use different target name than "track".

No need to delete the tracks past 83 as KF will ignore those anyway.
You're right, i didn't think about overwriting :oops: .
This one should be correct: https://pastebin.com/4rBdUfuu

harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Tue Nov 05, 2019 3:14 pm

I also made some research to find the syntax to create an image from preservation stream, i got this:

dtc -fc:\...\Stream_Files\00.0.raw -i0 -fc:\...\Disk_1.img -i6 -m1

ZrX
Posts: 577
Joined: Tue Dec 06, 2011 9:09 pm

Re: Need advice on how to recover 5.25" floppy

Post by ZrX » Tue Nov 05, 2019 3:21 pm

You can also add -l8 to clean up the status output a bit.

And perhaps set -m1 as the first switch.

harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Tue Nov 05, 2019 8:43 pm

ok, i tried to run the .bat file and then run dtc to make the image file, i got this:
https://pastebin.com/XaiiSVjj
It seems that it doesn't read the side1 tracks, any idea on how to solve this?
(the resulting image file is similar to the one I obtained using the GUI, but tracks are ordered in a different way)

EDIT: maybe i can rename the files to bypass this limitation? for example, rename "08.1" to "09.0" etc

ZrX
Posts: 577
Joined: Tue Dec 06, 2011 9:09 pm

Re: Need advice on how to recover 5.25" floppy

Post by ZrX » Tue Nov 05, 2019 10:21 pm

Ah, add -y -g2 -k2 before -i6.

harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Wed Nov 06, 2019 9:05 pm

ok, i got this: https://pastebin.com/tQVyXrkx
If seems that all side1 it's not formatted, so probably it's not a "flippy" disk and it's written only on one side, right?
This is the filtered view for the side1 tracks: https://pastebin.com/D8vkvwNi

ZrX
Posts: 577
Joined: Tue Dec 06, 2011 9:09 pm

Re: Need advice on how to recover 5.25" floppy

Post by ZrX » Thu Nov 07, 2019 6:51 am

Yes, seem to be onesided disk.

The scatter plot in the UI can be used to check if a side has any content. If there are 2-4 distinct well separated horizontal lines visible on a track it must have something written on it. Just a kind of a vertical gradient all around the track is just noise.

harlus
Posts: 29
Joined: Wed Jan 16, 2019 7:06 pm

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Thu Nov 07, 2019 7:09 pm

Yes, i also tried to extract the graphs and all the side1 tracks seem unformatted:

https://i.imgur.com/sAB8Zc9.jpg


It's all more clear now, thank for your help.
Just one last question: using -i6 output format, which is the real format of the output? It's a .img or a .d64?

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