> I have a brand spanking new 3TB disk (Seagate ST3000) and it is not
behaving.
> ... ‎
> umass1 at uhub0 port 6 configuration 1 interface 0 "JMicron USB to ATA/ATAPI 
> bridge" rev 2.00/1.00 addr 3
> umass1: using SCSI over Bulk-Only
> scsibus5 at umass1: 2 targets, initiator 0
> sd3 at scsibus5 targ 1 lun 0: <ST3000DM, 001-1ER166, > SCSI3 0/direct fixed 
> serial.152d2338000000000000
> sd3: 2861588MB, 512 bytes/sector, 5860533168 sectors
> umass1: Invalid CSW: tag 145 should be 146
> umass1: Phase Error, residue = 0

It appears the disk is attached with a USB adapter/enclosure?  Try attaching it 
directly to the motherboard's SATA port and see if that works?   Some USB 
adapters don't support drives above 2GB.  

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