Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 238)

APPENDIX
238
Step 7. Clean Saved SED Key
The ‘Disable SED Key” function is used to clear SED key on control -
ler and RAID set members.
• Save SEDKey In Controller
There is one SED key per controller which stores in the controller
flash memory. You can disable the SED Key saved in controller
flash using “Save SEDKey In Controller” on the Advanced Con -
figurations. So that next time power up again, it will ask for key
again.