#: 4823 S10/Tandy CoCo
    02-Jul-90  06:23:44
Sb: #4809-#os9 Disk Zapp
Fm: James Jones 76257,562
To: Denise Tomlinson 71021,3274 (X)

The best place to look is in the OS-9 Technical Manual, in the section on RBF. 
That shows the layout of directories, and the contents of file descriptor
sectors and LSN 0, which is what you need to know to unravel a scrambled disk.

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