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I've created an extended partition (ext4) on one of my hard-disks. here is what it looks like:

Filesystem             Size   Used  Avail Use% Mounted on

/dev/sdc5              158G   5,9G   144G   4% /media/YAHSI

why on earth there am i losing 8,1 GB space? when you add used & avail you don't get the size.

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up vote 9 down vote accepted

They are reserved for root and privileged processes. Run sudo tune2fs -m 0 /dev/sdc5 to free them up for regular users.

From the man page:

Reserving some number of filesystem blocks for use by privileged processes is done to avoid filesystem fragmentation, and to allow system daemons, such as syslogd(8), to continue to function correctly after non-privileged processes are prevented from writing to the filesystem.
Normally, the default percentage of reserved blocks is 5%.

If you are just using the partition for extra storage, you don't need the reserved space.

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