Earlier this year I posted my experience using a ByteCC 2.5 HDD enclosure with FireWire and USB 2.0 plugged into an Adaptec DuoConnect PC Card adapter on my laptop. Then I used a 30 GB HDD and had no problems. Today I replaced that 30 GB HDD with a Hitachi Travelstar 7K60 60 GB 7200 RPM HDD. I noticed the kernel reporting errors like the following when I tried to copy data from my laptop to the external HDD:
Nov 6 09:41:18 orr kernel: sbp0:0:0 No ocb(1468928c) on the queue
Nov 6 09:41:27 orr kernel: sbp0:0:0 No ocb(14689634) on the queue
Nov 6 09:41:40 orr kernel: sbp0:0:0 No ocb(146899dc) on the queue
Nov 6 09:41:40 orr kernel: sbp0:0:0 No ocb(14689d84) on the queue
Luckily this post suggested disabling Tagged Queueing, which I saw was enabling by default when the drive was recognized:
GEOM: create disk da0 dp=0xc3a84850
da0 at sbp0 bus 0 target 0 lun 0
da0:Fixed Direct Access SCSI-0 device
da0: 50.000MB/s transfers, Tagged Queueing Enabled
da0: 57231MB (117210240 512 byte sectors: 255H 63S/T 7296C)
I disabled Tagged Queueing using this syntax:
orr:/# camcontrol tags da0 -N 1
(pass0:sbp0:0:0:0): tagged openings now 1
(pass0:sbp0:0:0:0): device openings: 1
This change allowed me to use the external HDD with no problems.
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