Owner`s manual

USERS GUIDE

Mac OS 7.6.1+

Use ORB Tools for Mac to partition the ORB Disks. Either ORB Tools or the native

format utilities on the operating systems can be used to reformat the ORB Disks.

You can format a DOS formatted disk to Mac format with ORB Tools for Mac.

2.7 ULTRA SCSI PERFORMANCE

In order for your ORB Drive to achieve Ultra SCSI performance, all of the following

conditions must be met.

• Ultra SCSI host bus adapter – the SCSI host bus adapter used must support Ultra

SCSI protocols.

• Use same type of high quality cable – avoid mixing brands and types of cables.

• Minimize cable length – Keep the cables between SCSI devices as short as possi-

ble. For Ultra SCSI performance, the maximum allowable total cable length is 9.8

feet (3 meters) for a SCSI chain of 1 to 4 devices and 4.9 feet (1.5 meters) for 5

to 8 devices. It’s best to stay closer to 4.9 feet than 9.8 feet. Total cable length

includes the length of all internal cables as well as external cables.

• SCSI chain is actively terminated – active termination is required for Ultra SCSI

performance.

• All devices on the SCSI chain support Ultra SCSI – backward compatible with

previous SCSI versions is possible but all devices will perform at the level of the

slowest connected SCSI devices.

2.8 SCSI TIPS

• Power on SCSI devices before your computer – some devices can only be recog-

nized when it is powered on before the computer. Refer to the manual of each

SCSI device for more information.

• Power on all devices on the SCSI chain while your computer is powered on – even

if a device on the SCSI chain is not intended to be used, it must be powered on

for a proper SCSI signal path.

• Terminate the first and the last device – if there is no internal SCSI device, the

SCSI host bus adapter or the Mac’s main logic board should be terminated. In

addition, the last physical device on the external SCSI chain should also be ter-

minated.

• Do not need to terminate the same device twice – do not need to attach an active

terminator to a device that already has a built-in active terminator.

• Each device has a unique SCSI ID – If two devices have the same SCSI IDs, they

will not be properly recognized and data may be lost.

• Always power off your computer and all peripheral before reconfigure the SCSI

chain – Electrical power should be turned off before connecting, disconnecting

any cables or changing SCSI ID; otherwise, your drive or computer equipment

could be damaged.