Tejun Heo wrote:
As _GTF commands can't transfer data, device error never signals
transfer error.  It indicates that the device vetoed the operation, so
it's meaningless to retry.
..

The SECURITY commands may pass a data block to the drive,
containing the password required to unlock/freeze a drive.
I suspect ACPI on many machines will issue such a command,
and it does indeed transfer data (512 bytes).

????
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