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Thread: Scandisk and floppy recovery

  1. #1

    Default Scandisk and floppy recovery

    When you have a floppy disk with bad sectors, assuming you have some free space on the disk you can usually save the data by letting scandisk do a surface scan and it moves data from damaged sectors to unused sectors.

    If the data was unreadable to begin with (you tried to copy the files off the floppy and couldn't) then how was scandisk able to move the data?

    Is there some kind of error correction going on? If so then why can't that be used in dos when trying to read the disk.

    Also, if there isn't enough free space on the floppy, is there a way to have scandisk copy the data to another drive, or is there another tool that can do this?

  2. #2
    Join Date
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    Welcome to these forums.

    Quote Originally Posted by Divarin View Post
    When you have a floppy disk with bad sectors, assuming you have some free space on the disk you can usually save the data by letting scandisk do a surface scan and it moves data from damaged sectors to unused sectors.

    If the data was unreadable to begin with (you tried to copy the files off the floppy and couldn't) then how was scandisk able to move the data?
    If the sector is truly unreadable, no software will be able to read the sector.

    But there can be 'marginal' sectors (readable sometimes), and because diagnostic tools make significantly more attempts at reading the sector compared to DOS, the tool has a better chance of eventually making a successful read.

  3. #3
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    I bought a program a long time ago called Bad Copy Pro https://www.jufsoft.com/ that is comprehensive data recovery software for Floppy Disk, CD, DVD, Zip Disk, Digital Media, and Flash Drives.

  4. #4
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    Even with the best multi-media package, there's just so much that can be done with standard floppy routines.

    You can go very low level with special hardware and often recover data that no commercial package can. It's mostly a matter of working on it. For example, if a data error in a floppy sector is flagged, sometimes it's possible to read the bad data, identify where the data goes bad and manually correct it to the end of the sector. Or if the ID address mark is screwed up, giving you a "sector not found", can you issue a "Read Track", which ignores sector ID headers and reads all data sectors from index to index?

    You get the idea. Recall that floppies are victims of their own past. So, for example, you'll find no floppy controllers that feature ECC, even though that's theoretically possible.

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