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Why can't Ubuntu see any free space?

I have a hard drive that should have close to 40GB free. However, when I just restarted the computer, Ubuntu popped up with the notification stating that the drive has 0 bytes of space remaining.

When I run df -h I get the following output:

Filesystem            Size  Used Avail Use% Mounted on
/dev/sdc5             721G  684G     0 100% /media/Storage1

As you can tell, 684G + 0GB != 721GB, instead I should have 37GB available.

Running fsck /dev/sdc5 showed that there are no problems and nothing was recovered on the ext3 mount.

Where did my missing 30GB go? How can I get them back?

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marked as duplicate by fossfreedom, Gilles, Jorge Castro, jokerdino, htorque Jan 29 '12 at 18:05

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2 Answers 2

up vote 5 down vote accepted

Sounds like the 5% reservation for the root user. You can change that with

sudo tune2fs -m 1 /dev/sdc5

to 1% like in this example. If it is just a storage partition 0% should be OK too.

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By default 5% on a ext3 file system are reserved for root. You can change this using

sudo tune2fs -m 0 /dev/sdc5
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