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Old 01-15-2010, 01:45 PM   #1
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Registered: Feb 2006
Location: Denmark
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ExtN usb disks mount options

When using usb disks, there seems to be a difference in how they are mounted, based on the filesystem type on the disk.

Vfat disks are mounted read/write for users, while extN filesystems are not.

While I can fix that for individual devices, I would like to find a general solution, so that any usb storage device with any filesystem is mounted read/write for users.

I'm using arch linux.

Do you know how to do that?
Old 01-16-2010, 09:15 AM   #2
Registered: Jun 2009
Location: Penang, Malaysia
Distribution: Mageia, CentOS, Ubuntu
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There's a very good reason for this difference.
For vfat & ntfs, because they do not natively understand Linux permissions, a generic set of permissions is grafted on during the mount process. For most distros, this gives everyone full read/write access to the partition.

While on ext2/3/4, they do understand Linux permissions & so you have the chance to set or change these permissions for every partition (or device in your case). After you have mounted a partition to a mount point, you need only to change the permissions on that mount point & it will remember it. For example, if your device is mounted at /media/disk and your username is alund. This is what you could do to give your user access.
# chown alund.alund /media/disk
This sets your user alund as the owner, so now you have full access. If you want everyone on your system to access it, you could also do this:
# chmod 777 /media/disk
The filesystem on the device will remember these changes.


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