NEC MH4000, User Manual

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2-3
Features
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System board has four EISA slots and six PCI slots
for add-in boards. The system board also has a riser
board for external I/O (serial, parallel, video)
interfaces.
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Chassis can hold 11 drives: 6 hot-swap bays for
3 1/2-inch ultra wide SCSI-2 hard drives; three
5 1/4-inch half-height bays for removable media
drives with a CD-ROM reader already installed in
one bay; and two 3 1/2-inch half-height bays with a
diskette drive already installed in one bay.
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Chassis supports up to three power supplies. The
third power supply can be added to provide
redundant power.
Configuration Constraints
Power supplies are hot-swappable and are easily
removed and installed. The third optional power supply
provides redundant power so that if one of the three
power supplies fail, the system will continue to operate
and the failed power supply can be hot swapped. That
is, the failed power supply is removed and replaced
without turning power off.
The system has three 5 1/4-inch half-height bays
accessible from the front. These bays are convenient for
diskette, tape, and CD-ROM drives (removable media).
Because of the EMI generated by hard drives, the
increased susceptibility to ESD, and cooling
requirements, hard drives should not be installed in
the 5 1/4-inch half-height bays.