Eric Gans 
French Dep't UCLA 
Los Angeles, CA 90024

XRASE.COM (v3.3) - Version 3.3 update: checks for gaps in 
remaining directory entries (a file with extents 1, 2 and 4 
will not be unerased); fixed a couple of bugs reading last  
directory sector, block vector; a few code improvements.

XRASE is an unerase program that,  unlike many such programs, (1) 
works  on all types of disks (2) will not unerase two versions of 
the  same file,  and (3) checks for reused allocation blocks  and 
will  not unerase a file part of which has been  reallocated.  It 
accepts only unambiguous filenames.  Unerased files are  restored 
to  the  current user area.  The output of the program tells  you 
whether  the  file has been unerased and if so  which  "extents." 
This  term is used a bit loosely to designate  directory  entries 
rather than extents in the narrow sense (=128 sectors).  This may 
be  confusing  to "end-users," since many systems will have  more 
than one extent per entry:  e.g.  the Kaypro-10 has two per entry 
on  both hard and double-sided floppy disks.  (CP/M  hackers  can 
find  this  information  from  the  "extent  mask"  in  the  disk 
parameter block.)  So tell your friends not to worry if they find 
they  have  unerased "only" extents 1 and 3 of a  file.  Versions 
3.2+ are reentrant;  as with ABUSER, to exit, type a CR at the >> 
prompt.

Format: xrase [d:]fn.ft (no wildcards)