Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 236)

APPENDIX
236
Step 5. Generate New SED Key
If you have evidence that the SED key is known to unauthorized
users, you can change the SED key again. Areca provides both au-
tomatically or password methods to generate a New key to replace
the foreign SED key.
Step 6. Exporting SED Key
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 comput-
er, you must first export the SED key.