- If the cable has two connectors, one of these connectors is attached to thehard disk drive, and the other attaches to the primary or secondary IDEconnector on the system board.Note: If you want to add another device, and your computer does notcome with a CD drive or DVD drive preinstalled, you will need asecond signal cable with three connectors. You will need an80-conductor ATA 100 signal cable if you are replacing the existingsignal cable or adding a second hard disk. ATA 100 signal cables arecolor-coded. The blue connector attaches to the system board, theblack connector attaches to the master device, and the gray middleconnector attaches to the secondary (or slave) device.If your computer comes with a CD drive or DVD drive, it will havean ATA 100 signal cable. However, if you are installing a hard diskdrive, you must change the switch or jumper setting on the CD driveor DVD drive to secondary and change the connector used for theCD drive or DVD drive to the gray middle connector.– The narrower signal cable has two connectors for attaching the diskette driveto the diskette-drive connector on the system board.Note: To locate connectors on the system board, see “Identifying parts on thesystem board” on page 56.The following are some important points to remember when connecting power andsignal cables to internal drives:v The drives that are preinstalled in your computer come with power and signalcables attached. If you replace any drives, it is important to remember whichcable is attached to which drive.v When you install a drive, ensure that the drive connector at the end of the signalcable is always connected to a drive; also, ensure that the drive connector at theother end is connected to the system board. This reduces electronic noise fromthe computer.v If two IDE devices are used on a single cable, one must be designated as theprimary or master device and the other as the secondary or slave device;otherwise, some of the IDE devices might not be recognized by the system. Theprimary or secondary designation is determined by switch or jumper settings oneach IDE device.v If two IDE devices are on a single cable, and only one is a hard disk drive, thehard disk drive must be set as the master device.v If you have only one IDE device on a cable, it must be set as master.For help in selecting drives, cables, and other options for your computer, see page9.Installing internal drivesTo install an internal drive:1. Remove the cover (see “Removing the cover” on page 53).Note: If your computer has a CD drive or DVD drive, you might need toremove the signal and power cables from the drive.2. Remove the bay panel and insert a flat–bladed screwdriver into one of the slotson the static shield in the drive bay into which you are installing the drive and62 User Guide