Symantec Utilities for Macintosh includes a bunch of recovery and
backup programs, and is a very useful thing to have. One of its most
useful functions that I have found is the ability to recover files
from an unreadable disk. This is a set of Disk Copy 4.2 images created
from the original disks.
Note that the installer is on disk 2, not disk 1 as you would expect.
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Added Symantec Tools 1.00 from 1989 and
"Understanding Hard Disk Management on the Macintosh" from 1989 with
Symantec Tools instructions.