Hard Disk Drive Storage; Four-Slot And Six-Slot Storage Subsystems - Compaq AlphaServer DS20E Reference Manual

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1.10 Hard Disk Drive Storage

The system comes with either a four-slot storage subsystem that holds
1.6-inch drives or a six-slot storage subsystem that holds 1.0-inch
drives. Figure 1–10 shows the storage subsystems.
Figure 1–10 Four-Slot and Six-Slot Storage Subsystems
DVA00047b
The storage system backplane contains on-board multimode terminators that
provide LVD (low voltage differential) termination to the bus when all devices
are LVD. If an SE (single-ended) device is installed in the backplane, the
terminators automatically switch to SE mode termination. All devices on the
bus will operate in SE mode and all transactions will be subject to SE speed and
length limitations.
System Overview 1-19