I am trying to use a Spectra 10000 AIT tape loader to back up my data
at home. The loader is at /dev/sg3 but if I try to query the status
with mtx I receive this error:

mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=yes
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Illegal Request
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Residual = 00 00 00 00
mtx: Request Sense: Additional Sense Code = 3D
mtx: Request Sense: Additional Sense Qualifier = 80
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
Mode sense (0x1A) for Page 0x1D failed
mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=yes
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Illegal Request
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Residual = 00 00 00 00
mtx: Request Sense: Additional Sense Code = 3D
mtx: Request Sense: Additional Sense Qualifier = 80
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
READ ELEMENT STATUS Command Failed

The MTX FAQ mentions this error:

Q:       I get
# mtx -f /dev/sgr status
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Not Ready
mtx: Request Sense: Additional Sense Code = 04
mtx: Request Sense: Additional Sense Qualifier = 8E
mtx: READ ELEMENT STATUS Command Failed
What gives?
A:       Make sure your loader is in random mode, not sequential mode. Most
"real" loaders (as vs. DAT autoloaders) will not properly report
status information unless they are in "random" mode.

How do I put my loader into random mode? I cannot find anything on the
internet about it.

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