You are planning to install a combination of devices in
your computer and do not want to install the operating
system on the default device.
You want to install an SCO OpenServer system from a tape
distribution and you wish to configure your tape drive at a
location other than the default.
You want to disable any erroneous device presence tests or
driver actions.
Following installation, you need to boot from a device that
was not configured at the time your kernel was created. For
example, the tape configuration on your emergency boot
floppy set no longer matches your system's current tape
drive configuration.