Need advice on how to recover 5.25" floppy

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ZrX
Posts: 578
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 8:32 pm

The resulting file from -i6 is d64 regardless of the suffix.

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 9:57 pm

it's there some way to save it in .img format?

brightcaster
Posts: 224
Joined: Fri Nov 08, 2013 10:48 pm

Re: Need advice on how to recover 5.25" floppy

Post by brightcaster » Sat Nov 09, 2019 10:16 am

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 aditional information stored in theese files (othing that isn't on the disk itself...).

So, if you wan't it in image format you can rename .d64 to .img ;-)

David

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

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Fri Nov 22, 2019 11:13 am

brightcaster wrote:
Sat Nov 09, 2019 10:16 am
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 aditional information stored in theese files (othing that isn't on the disk itself...).

So, if you wan't it in image format you can rename .d64 to .img ;-)

David
Ok perfect, thanks for the explanation ;)



I have another question, i'm just curious about this disk (it's probably a MFM disk, not related to c64 disks):
https://filebin.net/wuw31kto54w81vev
It seems unformatted but looking at the graphs it seems there is something, it's not noisy like unformatted tracks. Have you any idea of what it is? Physically the surface of the disk seems brand new (no scratches).
It's not an important disk, i'm just curious.

brightcaster
Posts: 224
Joined: Fri Nov 08, 2013 10:48 pm

Re: Need advice on how to recover 5.25" floppy

Post by brightcaster » Fri Nov 22, 2019 8:53 pm

Just a quick shot: Could be a 80 track disk reading with a 40 track drive! As there are shades of a 15 sectors per track format maybe a 1,2Mbyte DOS Disk?

David

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

Re: Need advice on how to recover 5.25" floppy

Post by harlus » Fri Nov 22, 2019 11:42 pm

brightcaster wrote:
Fri Nov 22, 2019 8:53 pm
Just a quick shot: Could be a 80 track disk reading with a 40 track drive! As there are shades of a 15 sectors per track format maybe a 1,2Mbyte DOS Disk?

David
I'm not sure if i understood your question, however this is the label on the disk:

https://i.imgur.com/Qj2yPxI.jpg

SomeGuy
Posts: 243
Joined: Wed Feb 18, 2015 8:18 pm

Re: Need advice on how to recover 5.25" floppy

Post by SomeGuy » Sat Nov 23, 2019 12:05 am

That is a 1.2mb (96tpi/80track high density) floppy disk. You must read it using a 1.2mb 5.25" floppy drive. It will not read in a 360k (48tpi/40track low density) drive.

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