[Coco] Challenge: identifying file type by sector of data

Allen Huffman alsplace at pobox.com
Tue Jan 13 18:49:05 EST 2015


> On Jan 13, 2015, at 2:06 PM, Robert Gault <robert.gault at att.net> wrote:
> If these are 5.25" disks, what frequently goes wrong is that the sleeve gets squashed such that the friction of the sleeve on the disk both slows down the disk and can generate enough heat to erase the disk.
> If you break the welds on the sleeve and spread all the edges, you can get these disks to work normally assuming the data is still there. You would need to remove the disk from the sleeve while spreading the edges. MAKE SURE YOU DO NOT FLIP THE DISK RELATIVE TO THE SLEEVE when you return it. The sides MUST match!

Are you meaning I could take the disc out of the sleeve and it might let me read the one bad sector? Ditto on other disks?

> Now if it is just an rpm problem, you can adjust the drive using the strobe. I have a software program that will measure the rpm for you so an adjustment can be made more easily.

Wow. That takes me back. I believe OS-9 Level 1 had a speed test on its boot disk, didn’t it?

		— Allen





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