IBM 704 manual Scsi Drives, Maximum Allowable Drive Sizes

Installing Internal Drives

Table 3 shows the widths, types, and maximum heights for the drives that you can install in each bay.

Bay or Bank	Drive Width	Drive Type	Drive Height
Upper left	3.5-inch	Diskette	Half-high
Upper-left	3.5-inch or	Removable media1	Half-high
front	5.25-inch
Hot-Swap	3.5-inch	Hard disk,	Half-high
		hot-swap2

Notes:

1. Removable media include CD-ROMs and tapes. Installing hard disk drives in these bays is not recommended due to ESD and EMI issues.

2. If a hard disk drive is preinstalled, it is the startup (or boot) drive.

Table 3. Maximum Allowable Drive Sizes

SCSI Drives

Some drives have a special design called small computer system interface, or “SCSI.” This design allows you to attach multiple drives to a single SCSI-2 connector.

Notes:

1.Any information about SCSI drives also applies to other SCSI devices, such as scanners and printers.

2.If you plan to install both internal and external SCSI devices, you must follow the instructions in “Connecting External Options” on page 207, in addition to the instructions in this section.

A 16-bit (wide) SCSI cable connects each hot-swap backplane to an integrated SCSI-2 controller on the system board; and an 8-bit SCSI cable connects the CD-ROM drive to the 8-bit connector on the top backplane. The 8-bit cable connected to the CD-ROM drive has two empty connectors that you can use to support additional 8-bit SCSI devices in the upper-left front bays.

Chapter 4. Installing Options 159