Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 170)

WEB BROWSER-BASED CONFIGURATION
170
1. SED Key is generated automatically by internal random num-
ber for a SED RAID set use without needing a password in-
put.
2. SED Key is generated by user supplied password for a SED
RAID set use.
6.7.4.2 SED Key Management-Modification
If you have evidence that the SED key is known to unauthor-
ized users, you can change the SED key again. The ‘Disable SED
Key” function is used to clear SED key on controller and RAID
set members.
In some cases, you may want to export a SED key to store on
removable media or to use on a different computer. If you want
to create a backup copy of the SED key or use it on another
computer, you must first export the SED key. Exporting the SED
key puts it in a file (filename.bin) that you can then transfer to
another computer or put in a safe place.