Dell PowerEdge T610 Hardware Owner's Manual page 113

Grasp the storage card by its edge, carefully pull the card up to remove
b
it from the storage-card connector, and continue to pull the card up
and out of the card guides. See Figure 3-17.
CAUTION:
Disconnecting the RAID battery cable from a PERC card can cause
data loss if the "dirty cache" LED on the card is lit. The LED indicates that data is
still cached in controller memory and the data was not cleared at system
shutdown.
6 If applicable and necessary, disconnect the RAID battery cable from the
card. See Figure 3-17.
Installing System Components
113