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Working Inside the Server 35
For more information about devices supported, see your Apple-authorized dealer and the
support section of Apple’s World Wide Web site:
http://www.apple.com/support/
Additional Wide Ultra2 SCSI Drives
Your computer comes with two internal Wide Ultra2 SCSI drives. A PCI card and cable inside
the computer make it possible to connect an additional internal drive and external Wide
Ultra2 SCSI devices. You can connect up to three internal SCSI drives or connect additional
SCSI devices to the port the card provides on the rear of the computer.
Additional internal Wide Ultra2 SCSI devices connect to the data cable supporting the drive
that came with the computer. This cable has a built-in terminator so you don’t need to add
one.
You must assign a SCSI ID number to every additional device and the number must not
conflict with the ID number already assigned to a drive on the SCSI chain. Your Macintosh
comes with two drives with ID 0 and 1. A third factory-installed drive has ID 2. The SCSI PCI
card has ID 7.
Other Types of SCSI Drives
The SCSI card inside your Macintosh supports other types of Wide Ultra SCSI drives, as well
as Wide Ultra2 SCSI devices. However, if you mix the different kinds, your system will operate
at the speed of the slowest device. If you want optimal performance using the card, use only
Wide Ultra2 SCSI devices. To maintain optimal performance using another kind of SCSI
device, add a PCI card that supports the device.
Instructions for drive installation appear in the section “Installing a Hard Disk or Other
Internal Storage Device” on page 42.
Note: For information about the length of the cable to connect SCSI devices, see the section
“Cable Length Limits,” in the Technical Information booklet that came with your computer.
About PCI Expansion Cards
Your Macintosh can accommodate additional printed circuit boards (cards) for video and
graphics applications, networking and communications, additional processing power, or
other purposes. The cards fit into connectors, called expansion slots, inside the computer.
Note: Mac OS X Server does not support most add-on PCI cards or other devices requiring
drivers that are not built into Mac OS X Server.
Important Hard disk drives and removable storage devices may require special software for
the computer to recognize the device. Check the documentation that came with your device
or contact the device’s manufacturer for more information.