Path: utzoo!utgpu!attcan!uunet!husc6!rutgers!att!lzaz!hcj
From: hcj@lzaz.ATT.COM (HC Johnson)
Newsgroups: comp.os.minix
Subject: Re: Minx ST BUg
Summary: fixes for tos.c (atari)
Keywords: tos -r on hard disk
Message-ID: <260@lzaz.ATT.COM>
Date: 7 Nov 88 15:16:57 GMT
References: <Nov.7.08.05.51.1988.23172@topaz.rutgers.edu>
Organization: AT&T ISL Lincroft NJ USA
Lines: 23


tos.c contains several bugs.

1. only 127 clusters can be written correctly on a hard disk
   fix: on lines 1102 and 1103, remove the (char)

2. depending on the size of the hard disk partition, writing
   will both damage files and the start of a new file will be missing.

   This is due to the number of directory blocks (which are scaled to the 
   file system size.

   fix: change lines 339-343 to +FAT_START ));

3. Very large (16mb tos file systems) don't work at all.
   
   This is due to the fat size being > 32k, and sbrk, and read using signed
   integers.
   I have fixed it, but its too complicated for this posting.

4. PLEASE note.  The effect of error 1., is to permanently damage the tos
   file system.  I was using an empty one, so fixing just required 
   using dd to copy blocks of 0's over the fats and dir.  This is DANGEROUS!