[OT?] Enable hardware encryption on RDX...

After fiddling a bit with tapes, i'm trying to enable hardware encryption on
RDX, using stenc.

Seems supported:

 root@sdpve2:~# /usr/bin/stenc -f /dev/disk/by-id/usb-TANDBERG_RDX_008650987562-0:0 --detail
 Status for /dev/disk/by-id/usb-TANDBERG_RDX_008650987562-0:0
 --------------------------------------------------
 Device Mfg:              TANDBERG
 Product ID:              RDX             
 Product Revision:        0283
 Drive Encryption:        off
 Drive Output:            Not decrypting
                          Raw encrypted data not outputted
 Drive Input:             Not encrypting
 Key Instance Counter:    0
 Volume Encryption:       Unknown result '0'

But trying some set of 'address' index (at least, from 0 to 7) there's no
way to enroll the key:

 root@sdpve2:~# /usr/bin/stenc -f "/dev/disk/by-id/usb-TANDBERG_RDX_008650987562-0:0" -e mixed -a 0 -k "/etc/bacula/certs/sdpve2-8650987562-256-2025.key"
 Provided key length is 256 bits.
 Key checksum is 9c.
 Turning on encryption on device '/dev/disk/by-id/usb-TANDBERG_RDX_008650987562-0:0'...
 Sense Code:              Illegal Request (0x05)
  ASC:                    0x24
  ASCQ:                   0x00
  Additional data:        0x000000000000000000000000
 Error: Turning encryption on for '/dev/disk/by-id/usb-TANDBERG_RDX_008650987562-0:0' failed!
 Usage: stenc --version | -g <length> -k <file> [-kd <description>] | -f <device> [--detail] [-e <on/mixed/rawread/off> [-k <file>] [-kd <description>] [-a <index>] [--protect | --unprotect] [--ckod] ]
 Type 'man stenc' for more information.


I've tried also 128bit key. I've tried with mounted disk or unmounted.


Someone have some clue? Thanks.

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