Why is my tablet storage almost full? My Galaxy Tablet 10.1 has almost 14 GB of storage. Currently, it's about 13.5 GB full of stuff, but I have no idea what. Recently, when I have tried to install some apps, I get an error saying there is not enough space.

I have tried to clear out all unneeded apps, and cleared the data from apps I do have. For example, the Firefox app had the most data, at about 100 MB, so I cleared it out, but the difference was negligible. All my downloaded apps combined are nowhere near 1GB in total.

My device is rooted, and I have ES File explorer, so I went looking to see if there were any log files taking up space, but after extensive searches, I can't find any log files more than a few kilobytes in size.

I can't figure out what is taking up all the space on my tablet. How can I clean it up?
If you go to storage in settings, you can see a basic breakdown, I'm guessing apps wont be the biggest, however look to see if pictures and videos; audio; downloads; cache or misc. is taking up a lot of space and click on the relevant entry to have further actions (clearing cache, deleting downloads, etc..).

If this option isn't available in settings (it is in aosp, but may not be in touchwiz), try searching the play store for a comparable app (see @user284oo6).