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3.5 floppy disk need to format error
3.5 floppy disk need to format error




3.5 floppy disk need to format error

Then, cover the hole and try formatting it. Do this until you have gone over the entire disk.

3.5 floppy disk need to format error

Pass it over the disk radially outward from the center to the edges, like the spokes on a bike wheel. Something else that MIGHT be a good idea (but perhaps not absolutely necessary if I am mis-remembering my facts) is to demagnetize the improperly-formatted disks first using a strong neodymium magnet. The only exception to the above is if you use them exclusively in DD-only drives, in which case it's a moot point since they don't have the switch detecting the second drilled hole anyway and thus won't even care if it's there or not. Or, even if you do manage to get them formatted without covering the hole, the drive might refuse to properly read them afterwards and say the disk isn't formatted properly. More than likely, you'll get the infamous "Invalid media or Track 0 bad" if you try to format them without covering the hole. You likely will need to cover the drilled holes on the DD disks, as some drives may refuse to format them at 720K even with the /f:720 parameter if they have reason to think the disk isn't a DD disk. I tried using some of the other options like /1, or /f:360, but format just said 'yeah, your hardware can't do that'. I'd expect basically 50% (or 100%) bad sectors if one side was totally unwritable.

  • Is there any danger in formatting the 'single sided' floppies as ordinary double sided/double density floppies? Format did finish and either didn't detect ANY bad sectors on one disk, or only about ~10 kb on the second.
  • Is just using the /f:720 format option on the drilled floppies sufficient to get them back to proper 720 kb, or should I cover up the hole too? Format itself was certainly happy enough with the operation.
  • I reformatted those to the correct density they were designed for. Several of the double-density floppies were also drilled to reformat as 1.44 MB 😢. A good chunk of the floppies were double density, and even a few were labelled as single sided. So I picked up a box of floppies from my local thrift store and noticed the assortment was a bit odd.






    3.5 floppy disk need to format error