Hi.

>
> Dave Souza wrote:
>
> > Brian,
> >
> > The disk overlay program modifies your master boot record to allow it to
> > load the overlay program when you boot up.
> >
> > When you format a hard drive, the master boot record is not modified.
> > That's why formatting didn't get rid of the overlay program.
> >
> > If you want to get rid of the overlay, you can overwrite the master boot
> > record on your hard drive by typing:
> >
> > FDISK /MBR
> >
> > This should remove the overlay and allow you to format the drive normally.
> >
> > Dave Souza
>
> What do you do when FDISK /MBR doesn't work? Have done it about a dozen times
> and still can't get rid of it.
>
> Do you or anyone else have a low level format for Quantum drives?
>
> TIA
>
> Jose
>

        You should try FDISK /MBR booting from a DOS floppy, so that no
modification to bios INT 13H code comes from the MBR itself.
        With DEBUG you can do absolute writes to the first sector of your
hard disk (unit 80H for first disk). You can fill it with 0's and destroy
the MBR. You can try first with a floppy (unit 0 for first floppy) to see
how it works.
        You can also write an INT 13H routine to do the same; time ago one
was posted on this list. You can also assemble it with DEBUG.
        You can also use Norton stuff to do absolute writes.
        You can also throw the disk to fire or out of the window; surely the
MBR will be destroyed.

************************************
Javier Vizcaino. Ability Electronics. [log in to unmask]

Starting point:        (-1)^(-1) = -1
Applying logarithms: (-1)*ln(-1) = ln(-1)
Since ln(-1) <> 0, dividing:  -1 = 1
     (ln(-1) is complex, but exists)