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Changing a disk's volume number?


Keatah

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A sector editor will do if you know which byte in the VTOC to change.  But if you know that much about the VTOC, then it shouldn't be that hard to read a sector into memory (specifically Track 17 Sector 0), change the byte and write it back using a short applesoft program.

Edited by Iamgroot
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It's a little more than just changing the volume number in the VTOC. The volume # is also stored in each track like so. D5 AA 96 volume/track/sector/checksum DE AA EB.

 

And there was a program that could redo the entire track(s) with information you specify while leaving the user data alone.

Edited by Keatah
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  • 4 months later...
On 10/1/2020 at 5:56 AM, Keatah said:

It's a little more than just changing the volume number in the VTOC. The volume # is also stored in each track like so. D5 AA 96 volume/track/sector/checksum DE AA EB.

 

And there was a program that could redo the entire track(s) with information you specify while leaving the user data alone.

Not sure if this is the program you were thinking of, but I recently used "INIT" from the "Bag of Tricks" disk to correct volume # on and Einstein Compiler disk to 232 so it would run. You can change initialization uniquely on a track by track basis and has an option to preserve the existing data. Another thing I played with was changing the sector skew factor from default of 02 descending to 09 descending as recommended in the in the Bag of Trick manual. It does indeed cut disk load times of large binary and Applesoft files nearly in half.

a2_Bag_of_Tricks_1982_Quality_Software.gif

INIT_small.jpg

Edited by bolserst
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