Apple Power Macintosh G3 Informazioni Techniche Scaricare il pdf (Pagina 5)

Ultra Wide SCSI Hard Disk Drive and PCI Card

If your computer came with an Ultra Wide SCSI hard disk drive, it includes some or all of the

following components:

m in certain conﬁgurations, additional internal Ultra Wide SCSI hard disk drives

m an Ultra Wide SCSI card in one of your computer’s PCI slots

m an internal Ultra Wide SCSI cable that supports up to three internal devices (including your

pre-installed Ultra Wide hard disks)

About the Ultra Wide SCSI Bus

Up to three internal devices can be connected to the Ultra Wide SCSI bus on this card.

All devices on the same SCSI bus must have unique ID numbers, but devices on different SCSI

buses may use the same SCSI ID number. (For example, you could have a removable media

drive with ID number 3 connected to the computer’s built-in regular SCSI-1 bus and a hard

disk with ID number 3 connected to the Ultra Wide SCSI-3 bus.)

The hard disks installed in your computer at the factory and the SCSI card have reserved

certain SCSI ID numbers on the Ultra Wide SCSI bus. Other ID numbers are available for

assignment to SCSI devices that are added later, as described in the following table.

Warning

Do not connect any SCSI devices to the external 68-pin SCSI-3 connector or to

the internal 50-pin SCSI-2 connector on the PCI card that supports the internal hard disk.

Connecting even one external SCSI device to the external 68-pin connector extends the

overall cable length of the SCSI bus beyond the limit for which error-free operation can be

guaranteed; the combined length of the internal cable and the external cable reduces the

reliability of all the devices connected to the Ultra Wide SCSI bus. Connecting a device to

the internal 50-pin SCSI-2 connector will cause your Ultra Wide SCSI devices to transfer

data at the slower, SCSI-2 rate.

Ultra Wide SCSI ID Number

Device

0Factory-installed hard disk drive (terminated)

1 through 6 Available

7SCSI PCI card (terminated)

8 through 15 Available

If your computer came with two or more Ultra Wide SCSI hard disk drives, use the System Profiler program (available in the

Apple menu) to find out the SCSI ID numbers of your drives.

1 2 3 4 5 6 7 8 9 10 ... 15 16

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Apple Power Macintosh G3 Informazioni Techniche Pagina 5