Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 239)

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APPENDIX
<a> If enable --> disable, clear SED Key saved in setup
<b> If disable --> enable, if key exists, save to setup
If you setup from enable--->disable, the key will not remain in
the flash. So that next time power up again, it will need to input
the key from the CLI or McRAID manager again. The adapter vol-
ume will be in the lock stage. It will be not available to the OS.
After your run the CLI to upload the key, volume will be unlocked
and available to the OS. You can also import the key file (Im -
port Security Key), keyin the password (Enter SED Key By User
Password) from the GUI interface or keyin the password from the
BIOS screen on startup to unlock the volume.
(1) Import Security Key
(2) Enter SED Key By User Password
(3) Enter At BIOS Screen On Startup