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Old 11-23-2007, 08:59 PM   #1
Registered: Apr 2006
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Cool External Hard Drive Permissions

I have an external hard drive that is formatted NTFS and was a back-up drive for my windows system. I use Ubuntu 7.04 now and want to use this drive but the permissions will only allow read only. I have tried to change the permission in a terminal as root but does not work. I then tried to change owner but could not do that either. Is there any way to use this drive with Ubuntu and not lose the data that is already stored on this drive?
Old 11-23-2007, 10:00 PM   #2
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For the NTFS and VFAT filesystems you can't use the chmod and chown command. You need to set the ownership or permissions of the entire filesystem in the mount command (or the /etc/fstab entries).

Here is an example. I have the "fuse" package and the "ntfs-3g" package installed. This allows read/write access. You could simply modeprobe "ntfs" and use "-t ntfs" instead.

sudo /sbin/modprobe fuse
jschiwal@hpamd64:~> sudo mount -t ntfs-3g /dev/sda1 /mnt/xp -o defaults,uid=jschiwal,dmask=007,fmask=117
jschiwal@hpamd64:~> ls -ld /mnt/xp
drwxrwx--- 1 jschiwal root 24576 Oct 21 02:59 /mnt/xp
The "uid=" option changes the ownership. The "dmask=" and "fmask=" options change the permissions of directories and files respectively. The numbers are octal and mask out (remove) the corresponding permission.
You can also use "gid=" to change the group. For both "uid=" and "gid=" you can use either the UID/GID number or the username/groupname.

Last edited by jschiwal; 11-23-2007 at 10:04 PM.
Old 11-24-2007, 08:26 PM   #3
Registered: Apr 2006
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Distribution: Ubuntu 10.04 & Linux Mint 9
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Cool External Hard Drive Permissions

Thank You for the info I will give it a try.


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