我的硬盘是被格式化成NTFS格式了，借给同事一顿操作之后，插我电脑上就突然无法访问了，只能看到ubuntu识别到了设备/dev/sda1
使用root权限也无法挂载，报错如下：
sudo mount /dev/sda1 /media/xxx/External
$MFTMirr does not match $MFT (record 0).
Failed to mount '/dev/sda1': 输入/输出错误
NTFS is either inconsistent, or there is a hardware fault, or it's a
SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
then reboot into Windows twice. The usage of the /f parameter is very
important! If the device is a SoftRAID/FakeRAID then first activate
it and mount a different device under the /dev/mapper/ directory, (e.g.
/dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
for more details.
可以看到$MFTMirr does not match $MFT，这是这块硬盘无法访问的主要问题。是$MFT文件出现了问题，在windows下面可以使用chkdsk工具进行修复，在ubuntu下可以使用ntfsfix进行修复。
xxxx@xxxx-ubuntu:~$ sudo ntfsfix /dev/sda1
Mounting volume... $MFTMirr does not match $MFT (record 0).
FAILED
Attempting to correct errors...
Processing $MFT and $MFTMirr...
Reading $MFT... OK
Reading $MFTMirr... OK
Comparing $MFTMirr to $MFT... FAILED
Correcting differences in $MFTMirr record 0...OK
Processing of $MFT and $MFTMirr completed successfully.
Setting required flags on partition... OK
Going to empty the journal ($LogFile)... OK
Checking the alternate boot sector... OK
NTFS volume version is 3.1.
NTFS partition /dev/sda1 was processed successfully.
使用该sudo ntfsfix /dev/sda1 该命令修复过后，硬盘就能正常打开了
