What device do you have?

 

Your screenshots seem to answer your question...or am I misunderstanding it?

 

The Screenshots indicate that roughly 9GB of hard drive space is unaccounted for.

OP, have your tried booting into recovery and clearing cache?

Edit:Moved to the Galaxy Tab 2.0 Forum.

 

Yeah i was gona say that... it looks like the "available" is wrong

 

If you boot into recovery and only clear cache, you won't lose any data. However if you do a factory reset, it will wipe it virtually clean. Let me look up the button combo real quick to get into recovery for that device.

 

Alright, to boot into recovery, power down the device. Then once it's off, Hold Volume Up + Home, then while both buttons are held, then hold power with them so that all 3 are held at the same time.

 

Install this and reboot and see what's where.

 

It would be your capacitive home button for navigation while the tablet is turned on.

 

wipe cache partition. Apps like Google music/movies/books store their pinned content here along with other programs as here. clearing cache should clear up some space hopefully.

 

I've got two more ideas, but both involve data wipes and I don't know how willing you are to do that.

The first would be to boot back into recovery and use the factory reset option.

If that doesn't work, the second option is much more invasive and much more technical. I don't know how comfortable you'd be with this option.

 

Holy Bloat!

The System is using up 9GB, that is crazy high. If that's the case, since you're not rooted, the only option is to flash a factory image to re-write everything. This will data wipe unfortunately, but in this case, it's needed.

 

I don't know if the user tried also with clean master (ks mobile),it cleans also old empty data folders (cleans also microsd memory),it also cleans the gallery.I don't know if it will help much but it should be used in this case.