This text is taken from Chapter 4, pages 58 through 67 of the Setting Up Your Power Mac G4 manual. The entire Setting Up Your Power Mac G4 manuals can be downloaded from: http://support.apple.com/manuals/ .
Installing Internal Storage Devices
Your Macintosh has five internal drive bays. Three are in the lower part of the computer and two are in the front on top. In many configurations, a single hard disk drive occupies a computer's lower bay. One of the upper bays contains a DVD-ROM or DVD-RAM drive and some configurations have an optional Zip drive filling the upper bay.
You can add SCSI and ATA disk drives to the empty lower drive bays.
Drives must meet these specifications:
- Width: 100 mm
- Depth: 150 mm
- Height: 25 mm (ATA), 40 mm (SCSI)
The computer provides support for the following types of internal storage devices:
- ATA devices, including ATA, ATA-2, and ATA-3 devices
- Ultra ATA devices
- Ultra-66 ATA devices
- Wide Ultra SCSI devices
- Ultra2 and Ultra160 low voltage differential (LVD) SCSI devices
- ATAPI drives, including CD-ROM, DVD-ROM, DVD-RAM, and Zip drives
For more information about requirements and devices supported, see your Apple-authorized dealer and the support section of Apple's Web site: www.apple.com/support/ .
Installing Ultra ATA Drives
Your Macintosh can accommodate two internal 25 mm high ATA devices in the U-shaped drive carrier in drive position 3 in the computer. If your computer has one Ultra ATA drive, it sits in the lower portion of this U-shaped drive career. You can install a second ATA device in the upper part of the carrier.
1. Configure your Ultra ATA drive as the secondary drive (sometimes called the "slave drive" or "drive 1").
The drive that came with your Macintosh is designated the primary drive (sometimes called the "master drive" or "drive 0"). Your Macintosh doesn't work with Ultra ATA devices set for cable select mode.
2. Unplug the power cord bundle from the main logic board and the ribbon cable from the drive. (See Figure 1)
- Unlock the power cord bundle plug by pressing the small catch located on the side of the plug.
- Unplug the power cord bundle from the main logic board.
- Unplug the ribbon cable from the hard disk drive.
3. Remove the power cord bundle from the drive. (See Figure 2)
- Unplug the power cord bundle from the hard disk drive. There is no catch on this plug. The plug is held tightly in place, so pull firmly.
4. Remove the low-profile attachment screw from the drive carrier and tilt the carrier up to remove it from the computer. (See Figure 3)
- Remove the attachment screw to release the drive carrier.
- Tilt the drive carrier up and carefully pull it out of the computer.
5. Install the ATA drive in the U-shaped bracket. (See Figure 4)
Note: The four low-profile screws that came in the computer's accessory kit are used to attach a 25 mm high ATA drive in the lower portion of the drive carrier from the bottom.
- Attach an additional ATA drive (25 mm high) to the upper portion of the drive carrier by screwing it into position on its sides.
- Attach the two screws on this side first.
- The two tabs on the side of the carrier will bend inward as you tighten the two screws.
Position the hard disk drive on the drive carrier so that the ribbon cable connector and the power cord connector are accessible.
6. Replace the carrier and drive. (See Figure 5)
- Slide the hard disk drive into the computer at an angle, and lower it into position. Make sure the two tabs on the underside of the drive carrier engage the slots on the floor of the computer.
- Install the attachment screw to secure the drive carrier.
7. Restart the low-profile attachment screw you removed from the carrier in step 4.
8. Plug the power cord bundles into the hard disk drives. (See Figure 6)
- Plug the power cord bundles into the hard disk drives. Be sure to press them firmly into position.
- Tuck the excess power cord bundle cable around the side of the hard disk drives.
9. Reconnect the main power cord bundle to the main logic board and the ribbon cable to the drives. (See Figure 7)
- Plug the power cord bundle back into the main logic board.
- Plug the end of the ATA ribbon cable back into the bottom ATA drive.
- Plug the middle connector into the top ATA drive.
10. Close the computer.
Installing Ultra160 LVD SCSI Drives
If your Macintosh has an internal Ultra160 LVD SCSI drive, you can connect up to two more internal Ultra160 LVD SCSI drives to the PCI card and cable inside the computer. This cable has the required connectors and a built-in terminator, so you don't need to add one.
If you have one Ultra160 LVD SCSI drive, it is installed in the lower drive position 1. The computer uses the drive in position 1 to start up.
Note: If your computer doesn't have a SCSI hard disk drive, you need to install a SCSI PCI card in your computer to connect SCSI hard disks.
The procedures for disconnecting and connecting a SCSI hard disk drive and for removing and inserting drive carriers are nearly identical to those presented in the ATA drive installation instructions above. Follow the ATA drive instructions when installing a SCSI drive. However, before installing your SCSI drive, note the following differences.
When you configure your SCSI hard disk drive
Assign a unique SCSI ID number to each new device. A single factory-installed drive uses SCSI ID 0; a second factory-installed drive uses SCSI ID 1; and a third factory-installed drive uses SCSI ID 2. The SCSI PCI card has been assigned ID 7. If you select one of these numbers for a new drive, the drive will not work properly.
When you attach the drive to the carrier
If you're installing a SCSI drive in a model that came with one SCSI drive, install the new drive in position 3 (see "Inside Your Power Mac" Your Computer's Internal Expansion Options' on page 18). Do not install a SCSI drive in the top position of the U-shaped bracket. (See Figure 8)
- SCSI drives that are 25 mm high are attached to the lower portion of the drive carrier from the bottom.
- SCSI drives that are 40 mm high are attached to the lower portion of the drive carrier by screwing it into position on its sides.
- Position the hard disk drive on the drive carrier so that the ribbon cable connector and the power cord connector are accessible.
Note: The tinted screws in the previous illustration indicate the four low-profile screws that came in the computer's accessory kit. The untinted screws in the following illustration show the screws that came with the new drive. (See Figure 9)
- Attach additional SCSI drives (25 mm or 40 mm high) to the two flat drive carriers by screwing them into position from the bottom.
- Position the hard disk drive on the drive carrier so that the ribbon cable connector and the power cord connector are accessible. Screw the drive into position with the four screws supplied with the drive.
When you replace the carrier and reconnect the drive cables (See Figure 10)
- If your computer came with a SCSI hard disk drive installed in drive position 1, and you are installing a SCSI hard disk drive in drive position 2 or 3, put the ribbon cable on top of the drives. You can tape the ribbon cable to the tops of the drives with double-stick foam tape to make the cable lie flat.
- Make sure all of the power cord and ribbon cable connectors are firmly attached to all of the drives and to the PCI SCSI card.
- The ribbon cable may attach to a different position on the PCI SCSI card, depending on which card you have.