Date   : Wed, 31 Mar 1993 23:10:32 +0400
From   : DPetrov@... (Dimitry Petrov)
Subject: Re: broken ADFS floppys

matthew@... (Matthew Sweet) writes:

> It has been rather quiet around here recently.
> I have an ADFS floppy disc which refuses to mount
> due to an error 48 on :<drive>/000000.
>
> Can anyone help with any hints as to what is wrong,
> or what software I can use on a BBC B to try and
> repair the damage? - I suspect that the free space
> map has become corrupted somehow.

The simplest way is to do the following:
  1) Prepare a blank ADFS disk.
  2) Read sector 0 from the blank disk and write it to sector 0
of your disc
  3) Read sector 1 from the blank disk and write it to sector 1
of your disc
  4) Then try to *MOUNT your disc and copy all files to the blank disc.
  5) Reformat your disc (because its free space maps became invalid)

If you got an error after *Mount again, you'll need a slightly
more complicated actions to recover your data. Write me and I'll
try to help.

To read/write  sectors you could use the disc  editor called ADFSED or
write  your  own  program using OSWORD  &72  (if  I  remember the correct
number). Please write if you need a more detailed information...


Regards,
  Dmitry

---
 DPetrov@... (Dimitry Petrov)
 Russian ARM Support Group