Inch Disks for Desktops

By far the most popular form factor for hard drives today is the 3.5-inch design. These models measure 4.02 inches wide by 5.77 inches deep. These drives contain two connectors on one end: a SCSI or EIDE cable connector and a power connector (see Figure 5.6). They also usually have jumpers that are used to set various options, such as a SCSI ID number or EIDE master/slave status.

When mounted in a case, the end of the hard disk with the power and EIDE or SCSI interface connectors faces toward the appropriate motherboard or expansion card, so that the cables can be easily connected. Unfortunately, this placement often makes it difficult to access the jumpers on the opposite end of the drive, and units with side-mounted jumpers can be even more difficult to configure. You should be sure that you've set all the jumpers correctly before mounting a hard drive in the case.

Chapter 5

Figure 5.6

A hard disk resembles a featureless slab of metal, except for a circuit board on the underside, a pair of connectors, and a few jumpers.

Figure 5.6

A hard disk resembles a featureless slab of metal, except for a circuit board on the underside, a pair of connectors, and a few jumpers.

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