我有一个已加密的外部硬盘，我无法再识别它。插入后，使用 fdisk -l 即可显示，但过了一会儿就看不见了。然后又恢复了。这使得无法使用我的加密工具实际安装该设备。dmesg 日志显示：
[100783.278831] sd 36:0:0:0: [sdb] FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[100783.278832] sd 36:0:0:0: [sdb] CDB:
[100783.278833] Read(10): 28 00 00 00 00 80 00 00 f0 00
[100783.278837] blk_update_request: I/O error, dev sdb, sector 128
[100783.414610] usb 2-1: reset SuperSpeed USB device number 31 using xhci_hcd
[100783.430894] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9300
[100783.430897] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9348
[100783.590811] usb 2-1: reset SuperSpeed USB device number 31 using xhci_hcd
[100783.607012] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9300
[100783.607015] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9348
[100783.746824] usb 2-1: reset SuperSpeed USB device number 31 using xhci_hcd
[100783.762993] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9300
[100783.762995] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9348
[100784.110404] usb 2-1: Device not responding to setup address.
[100784.314570] usb 2-1: Device not responding to setup address.
[100784.515136] usb 2-1: device not accepting address 31, error -71
[100784.627316] usb 2-1: reset SuperSpeed USB device number 31 using xhci_hcd
[100784.643670] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9300
[100784.643673] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9348
[100784.847600] usb 2-1: reset SuperSpeed USB device number 31 using xhci_hcd
[100784.863679] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9300
[100784.863682] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880077ca9348
它似乎正在尝试从设备读取数据，但遇到了麻烦，因为它已完全加密，因此不会为操作系统提供任何可用的数据。
我正在使用 Ubuntu 15.04。Ubuntu 14.04 没有遇到过这样的问题。我的硬盘是不是自上次使用以来就损坏了，还是这是新版本引入的问题？