外接硬碟只能讀不能寫

先執行df -h 列出磁區
liaozi@ubuntu-desktop:~$ df -h
檔案系統        容量  已用  可用 已用% 掛載點
udev            1.9G     0  1.9G    0% /dev
tmpfs           380M  1.7M  379M    1% /run
/dev/sdc2        58G   17G   39G   30% /
tmpfs           1.9G   30M  1.9G    2% /dev/shm
tmpfs           5.0M  4.0K  5.0M    1% /run/lock
tmpfs           1.9G     0  1.9G    0% /sys/fs/cgroup
/dev/loop0       15M   15M     0  100% /snap/gnome-logs/37
/dev/loop1      2.4M  2.4M     0  100% /snap/gnome-calculator/180
/dev/loop2       87M   87M     0  100% /snap/core/4917
/dev/loop3      141M  141M     0  100% /snap/gnome-3-26-1604/70
/dev/loop4       13M   13M     0  100% /snap/gnome-characters/103
/dev/loop5       35M   35M     0  100% /snap/gtk-common-themes/319
/dev/loop6      3.8M  3.8M     0  100% /snap/gnome-system-monitor/51
/dev/sda2        96M   31M   66M   32% /boot/efi
tmpfs           380M   36K  380M    1% /run/user/1000
/dev/sdd1       1.9G  1.9G   49M   98% /media/liaozi/UBUNTU 18_0
/dev/sdb1       2.8T  2.8T  6.3G  100% /media/liaozi/3TB

無法存取的是 /dev/sdb1  

執行
sudo ntfsfix /dev/sdb1
Mounting volume... The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
FAILED
Attempting to correct errors...
Processing $MFT and $MFTMirr...
Reading $MFT... OK
Reading $MFTMirr... OK
Comparing $MFTMirr to $MFT... 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/sdb1 was processed successfully.

接著重載掛後就能存取寫入了