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ULTRA2 LVD SCSI HOST ADAPTER
4.6.2 T
HE
S
CAN
B
US
S
CREEN
If you select “Scan Bus” at the Main Menu and press ENTER, the Utility scans the
SCSI bus and displays a screen that lists, in the order of their SCSI IDs, the devices
it has found, as well as the IDs without any devices assigned to them. While you’re
at this screen, you can press <ENTER> to “Execute” a new scan (to rescan the bus).
Keep in mind that (a) the best ID for a bootable hard disk is ID 0, and
(b) otherwise, you should only change a device’s ID if it conflicts with the ID of
another device on the same bus (refer to the device’s documentation for how to do
this).
4.6.3 T
HE
D
EVICE
S
ETUP
M
ENU
If you select “Device Setup” at the Main Menu and press ENTER, the Utility displays a
screen listing all of the bus’s possible SCSI IDs and a set of attributes that you can set
for those IDs. Use the right-, left-, up-, and down-arrow keys to select any attribute,
the plus and minus keys to change the setting of the selected attribute, or <F8> to
reload the factory defaults for all attributes.
Asynchronous Transfer: Set this value to “Yes” or “No” (the factory-default
setting is “No”) to respectively enable or disable asynchronous data transfer for the
corresponding ID. The maximum data rate at which the
Ultra2 LVD SCSI Host
Adapter
will transfer data asynchronously is 10 MB/second.
Maximum Synchronous Transfer Rate: Set this value to the maximum sync data
rate
at which the correpsonding devices can operate. (You can press “+” and “–” to
cycle through the possible settings.) Your Adapter will run at 80 MB/second; this is
the factory-default setting for all SCSI IDs. Whenever you connect a new SCSI
device to the Adapter’s bus, refer to the device’s
manual to determine its actual
maximum data rate. If you still can’t figure it out, set
this value
to 10.0
(10 MB/second) until you can contact the device’s manufacturer.
DOS Space > 1 GB: This value has to do with how information stored on SCSI
hard drives is accessed. (It has no meaning for non-hard-drive devices.) Under the
“No” setting, the Adapter assumes that the corresponding drive has a maximum of
64 read/write heads and 32 sectors, a “head-mapping” configuration that conforms
to the normal MS-DOS limit of 1024 cylinders (one gigabyte of capacity). Under
the factory-default “Yes” setting, the Adapter assumes that the drive has a
maximum of 255 heads and 63 sectors, an 8032-cylinder head-mapping
configuration that corresponds to almost 8 GB of DOS-accessible capacity.