[USB] JetFlash TS1GJF2B 2.00 Attempt to query devicesizefailed: UNIT ATTENTION

Wilkinson, Alex alex.wilkinson at dsto.defence.gov.au
Mon Jan 10 17:44:43 PST 2005


    0n Tue, Jan 11, 2005 at 10:39:56AM +1030, Wilkinson, Alex wrote: 

    >    >>    (da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
    >    >>    (da0:umass-sim0:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
    >    >>    (da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
    >    >>    (da0:umass-sim0:0:0:0): SCSI Status: Check Condition
    >    >>    (da0:umass-sim0:0:0:0): UNIT ATTENTION asc:28,0
    >    >>    (da0:umass-sim0:0:0:0): Not ready to ready change, medium may have 
    >    >>    changed
    >    >>    (da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)

Okay, I'm trying to make sense of the aforementioned debug output.

1. (da0:umass-sim0:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0
   (da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error

   I'm suspecting that this means that the READ CAPACITY command
   failed, therefore we are unable to determine the device's 
   physical parameters.

2. (da0:umass-sim0:0:0:0): SCSI Status: Check Condition

   Looks like we are waiting to for the device to become ready to be
   accessed.

3. (da0:umass-sim0:0:0:0): UNIT ATTENTION asc:28,0
   (da0:umass-sim0:0:0:0): Not ready to ready change, medium may have changed

   This 'Additional Sense Code' seems to be where it fails. Looking at
   the RBC specs we should see an ASC/ASCQ of 'NEW MEDIA READY FOR
   ACCESS'. However, we don't.

This is as far as I can go without having my hand held. I would dearly
like to get this UMASS device working. 

Can any USB wizards please suggest quirks etc that could result in a
solution.

Thanks

 - Alex



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