--- Comment #44 from Hans Petter Selasky <> ---

Try also to exclude the timing of the SCSI commands as a source of USB errors.
When you are using bare metal, the commands execute more quickly. Sometimes, it
might happen that the USB firmware in the peer has blind eye, which cause it to
hang or lose the transferred command.

The following sysctl might be useful testing this.
hw.usb.umass.throttle: 0

Further there is:

Which can be used to test mass storage device to quickly reveal known issues.


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