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I made my own DOS implementation (Announce)

posted by samwdpckr, 16.12.2025, 03:34
(edited by samwdpckr on 16.12.2025, 04:08)

There's actually nothing wrong with that disk image. The problem is just that at some point Microsoft stopped conforming to the FAT specification. That's why FAT12/16 images that are created in other operating systems don't work properly on MS-DOS 6.22 and Windows.

If you read the output of that Norton tool carefully, you notice that it doesn't really make much sense at all. It even lists "errors" that aren't errors at all:

> Boot Record program is invalid
How does a disk utility know when the code there is "invalid" and when it isn't? You are allowed to have any code there - technically it doesn't even need to be x86 code.

You also seem to have one bad sector there, so your diskette is probably physically broken, if that isn't also some weird bug in the Norton Disk Doctor itself.

The FAT parser in NDD seems to be completely broken. Don't use it.

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