XenServer output of '# dmesg | tail -n 40' for USB3.0 port

# dmesg | tail -n 40
[194476.644339] ata9: SError: { 10B8B }
[194476.644344] ata9.00: failed command: READ DMA
[194476.644353] ata9.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
[194476.644354]          res 51/04:08:00:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[194476.644367] ata9.00: status: { DRDY ERR }
[194476.644372] ata9.00: error: { ABRT }
[194476.651444] ata9.00: configured for UDMA/33
[194476.651457] ata9: EH complete
[194476.651649] ata9.00: exception Emask 0x0 SAct 0x0 SErr 0x80000 action 0x0
[194476.651660] ata9.00: irq_stat 0x00060002, device error via D2H FIS
[194476.651667] ata9: SError: { 10B8B }
[194476.651673] ata9.00: failed command: READ DMA
[194476.651681] ata9.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
[194476.651682]          res 51/04:08:00:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[194476.651696] ata9.00: status: { DRDY ERR }
[194476.651700] ata9.00: error: { ABRT }
[194476.659066] ata9.00: configured for UDMA/33
[194476.659079] ata9: EH complete
[194476.659295] ata9.00: exception Emask 0x0 SAct 0x0 SErr 0x80000 action 0x0
[194476.659311] ata9.00: irq_stat 0x00060002, device error via D2H FIS
[194476.659318] ata9: SError: { 10B8B }
[194476.659324] ata9.00: failed command: READ DMA
[194476.659333] ata9.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
[194476.659334]          res 51/04:08:00:00:00/00:00:00:00:00/e0 Emask 0x1 (device error)
[194476.659347] ata9.00: status: { DRDY ERR }
[194476.659352] ata9.00: error: { ABRT }
[194476.666435] ata9.00: configured for UDMA/33
[194476.666448] sd 8:0:0:0: [sdf] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[194476.666451] sd 8:0:0:0: [sdf] Sense Key : Aborted Command [current] [descriptor]
[194476.666456] Descriptor sense data with sense descriptors (in hex):
[194476.666457]         72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[194476.666464]         00 00 00 00
[194476.666468] sd 8:0:0:0: [sdf] Add. Sense: No additional sense information
[194476.666471] sd 8:0:0:0: [sdf] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[194476.666478] end_request: I/O error, dev sdf, sector 0
[194476.666490] Buffer I/O error on device sdf, logical block 0
[194476.666506] ata9: EH complete
[195036.498428] usb 1-1: USB disconnect, address 2
[195036.691895] hub 1-0:1.0: over-current change on port 7
[195036.801873] hub 1-0:1.0: over-current change on port 8