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C-9
vices per system. Table C–3 shows configuration constraints for each
narrow, single-ended SCSI device type. If the system has internal
hard disk drives or a floppy disk drive, you must count them as SCSI
devices.
Table C–3. Narrow Single-Ended SCSI Bus Configuration Constraints
Narrow, Single-Ended SCSI Devices
Maximum Number of Each
Type of Device Allowed
Hard Disk Drives (internal and external)
Floppy Disk Drives
CD-ROM Drives
4-mm DDS Tape Drives (one internal)
9-track Tape Drives
650-MB Magneto-Optical Drives
Magneto-Optical Autochangers (see notice below)
Maximum Number of SCSI Devices
7
1
1
2
2
1
1
7
NOTICE: Magneto-Optical Autochangers use three SCSI-2 drive addresses.
Each address must be accounted for in the maximum number of
NSE SCSI devices allowed.
CAUTION: Do not mix narrow single-ended, ultra, wide–
SE and fast, wide differential SCSI peripherals
together on the same bus.