In the event of the Winchester boot tracks being lost (machine fails to
even look for /boot and/or reports NO OS) they can be restored. The SCO N1 and N2 disks or
emergency boot floppies can be used with the following commands. Type from a prompt: dd if=/etc/hdboot0 of=/dev/hd0a
dd if=/etc/hdboot1 of=/dev/hd0a bs=1k seek=1
If dparam is not present on the floppy disks then the Winchester should
be mounted to use the copy present in the winchester /bin directory. Then issue the
command:
dparam -w
which restores the master boot block which is at the beginning of the
disk, immediately following the fdisk table of the disk. This block contains the disk
parameter table which summarises the characteristics of the drive. Please note that the
dparam line is required on most Apricot equipment but may not be applicable to other
suppliers.
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