[Coco] Disk recovery from I/O ERRORs

[Bill Pierce]

Allen, I used to use the VIP "Zap" program. It's similar to using Ded in OS9. Using the "GAT" table, you should be able to reconstruct the files. The back of the DECB manual has a good section of how the RSDOS files are laid out on disk.
 

Bill Pierce
"Today is a good day... I woke up" - Ritchie Havens
 

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-----Original Message-----
From: Allen Huffman <alsplace at pobox.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sat, Jan 10, 2015 6:10 pm
Subject: [Coco] Disk recovery from I/O ERRORs


Does anyone know of a tool that will try to recover as many files as possible 
from a corrupted floppy disk? As you may recall, the BACKUP command will abort 
on an I/O error.

I have been using two approaches so far:

1. Manual sector copies, skipping errors (BASIC program I wrote, using ONERR and 
DSKI$/DSKO$).

2. File copy. Sometimes the corrupting isn't even in a file, so I wrote a BASIC 
program to run through the directory and do a manual COPY of each file, skipping 
bad ones.

But, one disk actually corrupted between DIRs and crashed a sector in the 
directory (four entries, I think?). The data to those files may still be on the 
disk, but I don't think there would be any easy way to reconstruct it.

I was quite a pro at repairing crashed OS-9 hard drives using disk editors and 
the technical reference manual, but I never did anything with RS-DOS.

		-- Allen


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