HP D3604-90004 - Manual (Page 34)

3 Installing Hardware Accessories
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Figure 3-3. Removing the Hot-Swap Disk Module
3. Wait for the drive to stop spinning, then turn the hot-swap disk module
slowly to its horizontal storage orientation.
4. Place the hot-swap disk module in an electrostatic protected container.
Do not stack hot-swap disk modules.
5. Replace the blank filler panel or install a replacement disk module.
CAUTION The storage system must be operated with all of the empty bays
covered by blank filler panels to ensure proper air flow for
continued reliability, and to maintain compliance with RFI and
safety standards.