Dell PowerEdge M420 Owner's Manual page 9

Figure 4. SSD Features
1. activity indicator (green)
2. status indicator (green and amber)
NOTE: If the SSD is in Advanced Host Controller Interface (AHCI) mode, the status LED remains off.
Drive-Status Indicator Pattern
Blinks green two times per second
Off
Blinks green, amber, and off
Blinks amber four times per second
Blinks green slowly
Steady green
Blinks green three seconds, amber three
seconds, and off six seconds
Condition
Identifying drive or preparing for removal
Drive ready for insertion or removal
NOTE: The drive status indicator remains off until all SSDs are
initialized after system power is applied. Drives are not ready
for insertion or removal during this time.
Drive predicted failure
Drive failed
Drive rebuilding
Drive online
Rebuild aborted
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