pott wrote:I knew that a small amount was required but not that much oO
A few more details:
In the case of Linux filesystems like ext3 and (I think) ext4, this space is reserved just after the format.
I remember some older topics with "complaints" on this reserved space as result of GParted. It has nothing to do with GParted, it has to do simply with the filesystem design and specification. GParted follows the default options.
It is possible to modify this reserved % by manually formatting a partition, however this would offer some better performance in the case of very specific directory structure and file types (i.e. a filesystem with photo files only, or music files only, or multiGiB video only, etc). So, in the case of such a professional system, one could proceed to some fine tuning of the filesystem parameters, including the filesystem type it self.
So, be quite: GParted doesn't steal drive space, nor creates obscure hidden folders.
In the case of the ntfs filesystem the space for the file tables appears initially almost free, but it is occupied as long as you add files to the hard drive, so you don't really save any disk space.
*** It is highly recommended to backup any important files before doing resize/move operations. ***