[Q] What is this huge inaccessible "system data" chunk on my internal storage?
Note: I am NOT referring to the /system directory. I'm referring to a section of memory on my internal storage literally labeled "System data". See the first attached screenshot.
I noticed earlier today that I have way less space remaining than I should. I used DiskUsage to look at my internal memory, and a ~3GB chunk of it is taken up by something labeled "System data". It doesn't let me view this data and I can't figure out where/what it is. It's always listed as "other" when I view the used space in Solid Explorer or Airdroid. What is this space, and how can I reclaim it? My storage numbers also don't add up.
Stock rooted 4.2.1, 16GB.
I think it might be due (for the most part, at least) to CWM backups. As stated in ROM Manager: "In Android 4.2, backups are placed in secure directory, inaccessible to other apps." This was also speculated in a few other threads I found.
I deleted one of my 2 backups and the space used by "system data" was cut nearly in half, so I'm pretty sure it is the backups. However, the space used is not exactly the same as the size of the remaining backup, so maybe there are a couple other smaller things contributing to it as well.