🚀 go-pugleaf

In article <1992Aug27.141456.24146@schunix.uucp>, sonix@schunix.uucp (Duane Morin) writes:
> Ok, so, I stay home for ONE sick day, and when I come back, the boss tells me
> that his computer is dead.  This is what it says:  Missing Operating System.
> 
> <deleted>
>
> My question:  We don't want to completely reformat this disk, there's alot 
> of information on it that we hope not to lose.  I would figure that the 
> boot sector has been trashed, not the file allocation tables, so maybe 
> we can resurrect some of the data.  Does anyone know the best way to tackle
> this fairly nasty problem?  Like, can I get to the hard disk to write a new
> media descriptor?  How would I go about doing that?
> 
If you have another computer with the same hard disk, use debug to
transfer a copy of the boot sector from the good disk to the bad disk.

On the machine with the good disk:
C:> debug
-l 100 2 0 1
-n bootblok
-r cx
-CX 0000
: 0200
-w
Writing 00200 bytes
-q
c:>

What you have done is to read (l=load) into cs:100 from drive c (2)
starting at block 0 for 1 block.
The n command specifies a name for the w(write) and r(read) commands.
The r cx command displays the contents of the CX register, which
you then modify to 0200 (512) bytes.
The w command writes CX bytes to the named file.

On the machine with the bad disk, read the bootblock file into
memory and write it to disk

A:> debug bootblok
-w 100 2 0 1
-q
A:>

Let me know how it works out.

Gery Dueck
dueck@brandonu.ca