CRT Cellar

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Floppy Disk Rescue: Reading Mouldy Media Safely

Otto Brennan 14-07-2026 6 Comments
Photo for Floppy Disk Rescue: Reading Mouldy Media Safely

Mould on a floppy is not the end, but reading it in a good drive can be. Spores transfer to the heads and then to every disk after it.

The rescue order

  • Photograph the label before anything else.
  • Open the shell and clean the media with isopropyl.
  • Image the disk in one pass and verify the checksums.

You get one good read. Make it count and never put that disk back in a drive you care about.

Jonas Leclerc

We open the shell, clean the cookie by hand and read it once in a sacrificial drive, imaging the result straight away.

OT
OTTO BRENNAN AUTHOR
Member since 2019 8 posts

Arcade restorer and JAMMA wiring pedant. Otto has rebuilt more cabinets than he can fit in his garage, which is saying something.

COMMENTS

6 REPLIES
Sort:
  1. BI
    BITSHIFTER 17-07-2026 @ 17:07

    I tried this last winter and skipped the discharge step. Do not skip the discharge step.

    1. VB
      VBLANK 23-07-2026 @ 08:40

      Rosin flux from a jar, cleaned with isopropyl straight after.

  2. HU
    HUGO BRANDT 24-07-2026 @ 11:59

    Same board revision as mine, and the same two caps had leaked. Must be a batch thing.

    1. TO
      TOMASZ K. 28-07-2026 @ 03:41

      Parts list is going into the next post, promise.

  3. DU
    DUSTY_JOYSTICK 03-08-2026 @ 14:53

    Same board revision as mine, and the same two caps had leaked. Must be a batch thing.

  4. BE
    BETH ROWAN 05-08-2026 @ 14:28

    Came for the repair, stayed for the tangent about the manual layout.

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