With this approach it allows root to conduct administrative activities on the partition and perhaps move some data off. However, this is most critical when the partition contains / or home directories. For pure data partitions, this is just lost space. Five percent of a 250Gb partition is 12.5 Gb. Especially in the case of large partitions, it is safe to set the reserved space to the minimum, which is one percent or even to 0 percent.
There are two ways through which you can adjust this reserve percentage
1) At the time of creation of file-system:
# mkfs.ext3 -m 1/dev/sda1 (replace sda1 with your partition name)The above command creates a file system with only 1% of its space reserved for the root user.
2) After creation of file-system:
You can use tune2fs utility to reduce reserved blocks in ext2, ext3 as well as ext4 file-systems. To reduce reserved blocks to 1% use the following command:
# tune2fs -m 1 /dev/sda1 (replace sda1 with your partition name)In a 1 TB hard drive you can save upto 37GB of space after applying this tweak.
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source:http://linuxpoison.blogspot.com/2009/09/135781757119048.html