15.06.2020 18:10, Miroslav Lachman wrote:

> I am running FreeBSD 11.3. Whenever I inserted some 20 year old CD (backups 
> on CD-R) which is currently unreadable the system is trying to read the CD 
> even after I want to eject it by button in the CD drive or "eject" command.
> 
> These messages are repeatedly logged in messages
> 
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): Error 6, Unretryable error
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): cddone: got error 0x6 back
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): READ(10). CDB: 28 00 00 
> 00 00 00 00 00 11 00
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): CAM status: SCSI Status 
> Error
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): SCSI status: Check 
> Condition
> Jun 15 13:05:28 illbsd kernel: (cd0:ahcich2:0:0:0): SCSI sense: NOT READY 
> asc:3a,2 (Medium not present - tray open)
> 
> It can take from 1 to 5 minutes from pressing eject to actually open the 
> drive.
> 
> Is there something I can do to not wait too long for this? Any tuneables or 
> command to interrupt endless reading?

Perhaps it's GEOM doing multiple "taste" attempts to detetmine logical format 
of the media.
Try setting "sysctl kern.geom.notaste=1" temporary.


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