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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: net.micro.apple
Subject: Re: uncatalogable files
Message-ID: <297@neoucom.UUCP>
Date: Fri, 10-Oct-86 08:45:08 EDT
Article-I.D.: neoucom.297
Posted: Fri Oct 10 08:45:08 1986
Date-Received: Sat, 11-Oct-86 20:45:57 EDT
References: <8610091954.AA15615@ucbvax.Berkeley.EDU>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 40
Summary: Control characters in the file name

Hi,

	Most of the time the file name is a control or some other
unprintable / untypable character, presuming that the file is
allocated through the normal file system.

	The best way to get at them is to use a sector editor.
There are a number of P/D disk editors.  I think that you can also
get such things from companies like Beagle Brothers.  Before you go
to work on your disk, it would be a good idea to get the (Pro) DOS
technical referece manual from Apple/Addison-Wesley and/or the
Beneath the Apple DOS and/or Beneath Apple ProDOS.

	With a sector editor, you can read the sector(s) that
contain the catalog entries into memory and change the filename
fields to contain recognizable characters, and then rewrite to the
disk.  Hopefully the disk you're sector zapping is a back-up of the
original!!

	Sometimes, you can use DOS 3.3 "FID" or else the ProDOS
"FILER" to help you rename a file that you accidentally typed a
control character into the filename.  Just specify the rename
option, and use the "=" wildcard.  When the offensive file is
displayed as a blank line, or whatever, simply rename it; this
often works.

	Some protected software uses blank filenames as a cover
for sectors that they read and write directly.  If you move the
blank file, the original allocated sectors will be released in the
sector bit map and possibly allocated to other files, thus cuasing
corruption of the disk.

Hope this gives you a couple of ideas,
Bill

Bill Mayhew
Division of Basic Medical Sciences
Northeastern Ohio Universities' College of Medicine
Rootstown, OH  44272    USA    phone:  216-325-2511
(wtm@neoucom.UUCP  or  ...!cbosgd!neoucom!wtm)