Power and Signal Cables
Your computer uses cables to connect the power supply to the riser card and to
integrated drive electronics (IDE) drives. The diskette drive is also powered
through a cable attached to the riser card. The following cables are provided:
Four-wire power cables connect most drives to the power supply. At the ends of
these cables are plastic connectors that attach to different drives; these
connectors vary in size. Also, some power cables attach to the riser card.
Flat signal cables, sometimes called ribbon cables, connect IDE drives to the riser
card. There are two sizes of signal cables that come with your computer:
– The wider signal cable attaches to the installed hard disk drive and to the
primary IDE connector on the back of the riser card.
Note:
The IDE signal cable provided with the PC 300PL has a second
connector for attaching drives.
– The narrower signal cable attaches to the diskette drive and to the diskette
drive connector on the back of the riser card.
Note:
Each cable attaches to a connector on the riser card. To locate these
connectors, see “Riser Card” on page 27.
The following are some important points to remember when connecting power and
signal cables to internal drives:
The diskette drive and hard disk drive that are preinstalled in your computer
come with power and signal cables attached. If your computer comes with a
CD-ROM drive, it is attached to the secondary IDE connector on the back of the
riser card. If you replace any drives, it is important to remember which cables
are attached to which drives.
When you install a drive, ensure that the drive connector at the end of the
signal cable is always connected to the drive; also, ensure that the drive
connector at the other end is connected to the riser card. This reduces electronic
noise from the computer.
If more than one IDE device is used on a single cable, one must be designated
as the primary or master device and all others as slave or subordinate devices;
otherwise, some of the IDE devices might not be recognized by the system. The
master or slave designation is determined by switch or jumper settings on each
IDE device.
To optimize performance when installing more than two hard disk drives, be
sure to attach hard disk drives with faster data transfer speeds (Mode 1 or
higher) to the primary hard disk drive signal cable (hard disk drives 0 and 1).
Chapter 5. Working with Internal Drives
49
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