Dell Precision 490 Desktop User Manual page 57

1 sliding-plate lever 4 power supply
2 SATA data cable 5 SATA_2 connector
3 power cable 6 optional SATA hard drive in FlexBay
1 SAS data cable 4 SAS connector
2 power cable 5 optional SAS controller card
3 power supply 6 optional SAS hard drive in FlexBay
7. Disconnect the data cable from the back of the hard drive and from the connector on the system board.
If it is connected to a card and you will not be reinstalling the drive, route the data cable to the side.
8. Slide the sliding-plate lever to the right to release the shoulder screw and slide the drive out of the FlexBay.