OS/8 on-disk structure

[David Betz]

> Does anyone know if there is a scheme for mapping out bad blocks on  
> an OS/8 RX01 disk? I have an image of an RX01 disk that I'm trying  
> to retrieve data from and it seems to have bad data in the middle  
> of a file (4 blocks). Is there any chance these were bad blocks  
> that were mapped elsewhere on the disk?

I seem to have answered my own question. My program for reading files  
from an OS/8 image is working I guess. The problem seems to be that  
there are four bad blocks in my image. I'm not sure if that means  
that the original disk had bad blocks or if my imaging program had  
problems. I guess I need to find a way to attempt reading the 8"  
floppy again. Unfortunately, I've given away all of my 8" drives. :-(