[ 6.976601] sd 0:0:0:0: [sda] Test WP failed, assume Write Enabled
[ 6.992439] sd 0:0:0:0: [sda] Asking for cache data failed
[ 7.009603] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 7.030887] sd 0:0:0:0: [sda] Test WP failed, assume Write Enabled
[ 7.046857] sd 0:0:0:0: [sda] Asking for cache data failed
[ 7.053959] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 7.079533] sd 0:0:0:0: [sda] Attached SCSI disk

dmesg 启动的时候报这个错, /dev/sda 有这个设备, 但是没有分区, 而且 无法 fdisk

移动硬盘是 东芝（TOSHIBA）新黑甲虫系列 1TB 2.5英寸 USB3.0移动硬盘

root@raspberrypi:~# fdisk /dev/sda
fdisk: unable to read /dev/sda: 无效的参数

先
fdisk -l
看看

用root权限执行

插入移动硬盘
把新产生的输出全部复制贴上来

用root权限执行

插入移动硬盘
把新产生的输出全部复制贴上来

Aug 31 22:06:26 raspberrypi kernel: [116726.481916] usb 1-1.3: USB disconnect, device number 9
Aug 31 22:06:32 raspberrypi kernel: [116732.865501] usb 1-1.2.3: new high-speed USB device number 10 using dwc_otg
Aug 31 22:06:33 raspberrypi kernel: [116732.968351] usb 1-1.2.3: New USB device found, idVendor=0480, idProduct=a202
Aug 31 22:06:33 raspberrypi kernel: [116732.968396] usb 1-1.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 31 22:06:33 raspberrypi kernel: [116732.968415] usb 1-1.2.3: Product: External USB 3.0
Aug 31 22:06:33 raspberrypi kernel: [116732.968432] usb 1-1.2.3: Manufacturer: TOSHIBA
Aug 31 22:06:33 raspberrypi kernel: [116732.968448] usb 1-1.2.3: SerialNumber: 20150507008734C
Aug 31 22:06:33 raspberrypi kernel: [116732.973869] usb-storage 1-1.2.3:1.0: USB Mass Storage device detected
Aug 31 22:06:33 raspberrypi kernel: [116732.985842] scsi host4: usb-storage 1-1.2.3:1.0
Aug 31 22:06:35 raspberrypi kernel: [116735.814213] scsi 4:0:0:0: Direct-Access TOSHIBA External USB 3.0 5438 PQ: 0 ANSI: 6
Aug 31 22:06:35 raspberrypi kernel: [116735.820372] sd 4:0:0:0: Attached scsi generic sg0 type 0
Aug 31 22:06:35 raspberrypi kernel: [116735.820976] sd 4:0:0:0: [sda] Test WP failed, assume Write Enabled
Aug 31 22:06:35 raspberrypi kernel: [116735.822630] sd 4:0:0:0: [sda] Asking for cache data failed
Aug 31 22:06:35 raspberrypi kernel: [116735.822673] sd 4:0:0:0: [sda] Assuming drive cache: write through
Aug 31 22:06:35 raspberrypi kernel: [116735.834192] sd 4:0:0:0: [sda] Attached SCSI disk

试过了, 没有 我那个 移动硬盘

PS 我是7年 linux用户

1. Bug Report
http://askubuntu.com/questions/132100/e ... te-enabled
Constant warnings from the kernel: Test WP failed, assume Write Enabled

2. 暫時解決方案
https://bugs.launchpad.net/ubuntu/+sour ... omments/75

如果机器上有usb2.0的口子你可以接到它上面试试。或者自己编译最新的4.2内核，把所有usb storage的模块全编译进去，对7年linux用户应该是很简单的事了