5. Unit Identifier (UID) LED
6. Health LED
7. LAN LEDs
8. Disk Drive Power LED
9. Disk Drive Activity LED
10. USB 2.0 ports
Each drive bay features a latch that releases the pop-out tray handle, as shown in the
following figure.
Figure 18. Disk tray handle and release latch
1. Disk tray handle
2. Disk tray release latch
WARNING: No matter how many hard drives are installed in your system, ensure that
all drive trays remain in the drive bays to maintain proper airflow.
Hardware Manual49ReadyNAS 3220 and 4220
ReadyNAS OS 6