我有 2 个硬盘，它们通过 SATA-to-USB 工具连接。通常它们工作正常，但有时它们会出现故障，并且不会显示在磁盘上，我也无法在 dmesg 上看到连接。dmesg 输出连接信息，然后显示故障。
[ 879.083720] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 879.247885] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd
[ 879.267450] usb 2-1: New USB device found, idVendor=152d, idProduct=0539
[ 879.267459] usb 2-1: New USB device strings: Mfr=1, Product=11, SerialNumber=3
[ 879.267464] usb 2-1: Product: USB to ATA/ATAPI bridge
[ 879.267469] usb 2-1: Manufacturer: JMicron
[ 879.267473] usb 2-1: SerialNumber: 00A123456789
[ 879.268565] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 879.269478] usb-storage 2-1:1.0: Quirks match for vid 152d pid 0539: 4000000
[ 879.269525] scsi host7: usb-storage 2-1:1.0
[ 880.268102] scsi 7:0:0:0: Direct-Access JMicron 0000 PQ: 0 ANSI: 2 CCS
[ 880.268507] scsi 7:0:0:1: Direct-Access JMicron 0000 PQ: 0 ANSI: 2 CCS
[ 880.269396] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 880.269609] sd 7:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[ 880.270140] sd 7:0:0:0: [sdc] Write Protect is off
[ 880.270151] sd 7:0:0:0: [sdc] Mode Sense: 28 00 00 00
[ 880.270427] sd 7:0:0:1: Attached scsi generic sg3 type 0
[ 880.270839] sd 7:0:0:0: [sdc] No Caching mode page found
[ 880.270865] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 880.271124] sd 7:0:0:1: [sdd] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[ 880.273358] sd 7:0:0:1: [sdd] Write Protect is off
[ 880.273371] sd 7:0:0:1: [sdd] Mode Sense: 28 00 00 00
[ 880.274124] sd 7:0:0:1: [sdd] No Caching mode page found
[ 880.274137] sd 7:0:0:1: [sdd] Assuming drive cache: write through
[ 880.297883] sdc: sdc1
[ 880.337211] sd 7:0:0:0: [sdc] Attached SCSI disk
[ 880.427270] sdd: sdd1 sdd2
[ 880.434783] sd 7:0:0:1: [sdd] Attached SCSI disk
[ 881.939128] systemd-hostnamed[5342]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
[ 889.090534] xhci_hcd 0000:0b:00.0: xHCI host not responding to stop endpoint command.
[ 889.090546] xhci_hcd 0000:0b:00.0: Assuming host is dying, halting host.
[ 889.143511] xhci_hcd 0000:0b:00.0: Host not halted after 16000 microseconds.
[ 889.143520] xhci_hcd 0000:0b:00.0: Non-responsive xHCI host is not halting.
[ 889.143525] xhci_hcd 0000:0b:00.0: Completing active URBs anyway.
[ 889.143547] xhci_hcd 0000:0b:00.0: HC died; cleaning up
[ 905.666192] xhci_hcd 0000:0b:00.0: Stopped the command ring failed, maybe the host is dead
[ 905.719071] xhci_hcd 0000:0b:00.0: Host not halted after 16000 microseconds.
[ 905.719079] xhci_hcd 0000:0b:00.0: Abort command ring failed
[ 905.719085] xhci_hcd 0000:0b:00.0: HC died; cleaning up
[ 905.719233] sched: RT throttling activated
[ 905.719288] usb usb1-port1: couldn't allocate usb_device
[ 905.719963] usb 2-1: USB disconnect, device number 2
即使我重新插入或关闭/打开设备，dmesg 也不会改变。我无法安装驱动程序，直到重新启动。
Ubuntu 14.04 LTS 64 位
内核：3.19.0-31-generic