Hi folks

I know a load of people on these forums use some sort of LINUX on NAS systems whether dedicated or "home built" for file sharing / media serving.

A very common file system used these days is on those systems EXT4. Typically this reserves between 5% and 10% for "Super user" or root when the file system is created.

If you are simply using these drives as data drives e,g attached as external USB HDD's etc then you don't need to reserve any space for "super user" and say you have large HDD's you can reclaim a decent amount of space by setting this back to 0%.

So say the hdd is /dev/sdb

simply as root (or sudo) issue command tune2fs -m 0 /dev/sdb

You don't need to umount the hdd nor will you lose any data - even on RAID configurations.