Re: 1571 disk errors - sometimes
                                       
   From: John Iannetta <76703.4244@CompuServe.COM>
   Reply to: John Iannetta
   Date: Wed, 23 Sep 1998 11:24:47 -0400
   Organization: CompuServe, Inc. (1-800-689-0736)
   References:
          <3606E672.579A@spamsuxdoitnow.com>
    John/Lori said,

"I've been trying out Star commander with a couple of 1571 disk drives
I've been making .d64 files from a copy protected disk.
The disk has two error sectors T1 S0, T13 S9.  Both usually (but not
always) show a error 23 (checksum)
I know the T13 S9 error is part of the copy protection.".

    If a 23 error was intentionally put into a sector, it can easily be removed
(if the disk is good) by running this BASIC program:

10 print:input"device number";d
20 print:input"track";t
30 print:input"sector";s
40 open15,d,15:open8,d,8,"#"
50 print#15,"u1";8;0;t;s:print
60 input#15,j,o$,h,n:printj;o$;h;n
70 print#15,"u2";8;0;t;s:print
80 input#15,j,o$,h,n:printj;o$;h;n
90 close15:close8

You should see an error message on the first run, but not on subsequent runs.
The 1,0 error may or may not be corrected by that program, it probably will be.
But there will most certainly be data corruption on that sector, which may or
may not be acceptable.

--
When backing up your hard drive, shift into reverse gear S M O O T H L Y.

                      John