Apple II
File Type Notes
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                                                  Developer Technical Support

File Type:         $01 (1)
Auxiliary Type:    All

Full Name:     Bad Blocks file
Short Name:    Bad blocks

Written by:    Matt Deatherage                                     March 1990

Files of this type and auxiliary type contain blocks that should not be used 
by the file system.
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Files of type $01 contain physical media blocks that should not be used by the 
file system.  A utility program can scan a disk looking for blocks that cannot 
be read and can then synthesize a file containing those blocks.  Such a file 
should have type $01.

Files of this type should not be touched.  If a program finds one, it should 
leave it alone.  If you must delete such a file, be sure to double-check with 
the user.

Versions of ProDOS 8 prior to 1.8 can cause file system corruption (on ProDOS 
disks, of course) if you attempt to delete a file of bad blocks, so be sure 
not to do this.  Attempting to delete a bad blocks file is only marginally 
reasonable for people manually attempting disk repair.  A bad blocks scanning 
utility does not need to delete the old bad blocks files before creating new 
ones; it should just create new files as necessary.  Apple Computer, Inc., 
does not support deleting a bad blocks file.

The auxiliary types for this file type are reserved; any files created of type 
$01 should be created with auxiliary type $0000.

