https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249395

--- Comment #4 from Trenton Schulz <[email protected]> ---
John, the device I was doing this with was a USB Blu-ray drive from ASUS. The
dmesg I get is:

umass0 on uhub1
umass0: <Generic External, class 0/0, rev 2.00/1.07, addr 3> on usbus1
umass0:  SCSI over Bulk-Only; quirks = 0x4000
umass0:6:0: Attached to scbus6
cd0 at umass-sim0 bus 0 scbus6 target 0 lun 0
cd0: <ASUS SBW-06D2X-U D501> Removable CD-ROM SCSI device
cd0: 40.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray
closed
cd0: quirks=0x10<10_BYTE_ONLY>


So, maybe it is an issue with umass and not ACHI.

Hope this helps.

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