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If any hard drive connected to the Adapter already has data stored on it,
changing the head mapping will corrupt or erase that data and could
cause other unexpected problems. If you want to keep the data on a
drive, please back it up before changing the "DOS Space > 1GB" setting,
then delete the target drive's existing partitions with this Setup Utility's
"Format" Disk Utility function or the DOS FDISK utility. Then, after you
change this setting, you can restore and reinstall from the backup.
All device drivers for the Adapter will support different head mappings based on
the setting of this option:
Under MS-DOS, OS/2, and Windows NT, we recommend the "Yes" setting for
any hard disk whose capacity is greater than 1 GB.
SCO UNIX does not have a 1-GB barrier, but it must know whether or not the
boot-file system is located within the first 1024 cylinders of disk space in order to
perform its kernel-boot routines. If your root file system is larger than 1 GB or is
located beyond the first 1 GB of disk space, you should set "Dos Space > 1GB" to
"Yes." Otherwise, you can safely set it to "No" (although, to be on the safe side, we
recommend that you set it to "Yes" anyway).
Note that, unlike the other operating systems the Adapter supports, SCO UNIX
cannot support having drives with different head mappings attached to the same
bus (channel). The head mapping used on the drive with SCSI ID 0 must be used
on all other drives attached to the same bus.
On machines running multiple operating systems, you must use the same head
mapping for any given hard drive across operating systems. Unless one of your oper-
ating systems is SCO UNIX, however, different drives can have different head mappings.
In general, we recommend that, to be on the safe side, you set "DOS Space >
1GB" to "Yes" for any SCSI hard disk with capacity greater than 1GB.
Spin Up Disk Drive: Set this option to "Yes" to have the SCSI Host Adapter
initiate motor spin-up for SCSI disk drives. This way, the Adapter's BIOS can
conserve system power during boot-up by signaling the attached devices to start at
delayed intervals. The factory-default setting for this option is "No." This option
has no effect on peripherals that are not disk drives.
CHAPTER 4: Installation and Configuration
CAUTION!
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