[Galaxy Tab 10.1 General] slack04:
Hi all- I have a 16gb GT10.1 and, while 16gb of storage was more than I could have dreamt of having in my first computer, it's not a lot once you've had your tablet for a few months. 100 apps + copilot GPS maps (deleted all but NA) + a gig of music, and I end up so low on space I can't do a new backup. I don't keep any videos on the tab, but it's fine with me because streaming works great on the GT10.1 (allshare, netflix, grooveshark, and google music beta FTW!). With only one nandroid backup and one Titanium backup I still find that I usually don't have more than 1-3 gigs of space left, and it often drops to less than one gig, especially if I forget to delete my old nandroid backup. Using the "clear data" function when installing a new ROM through CWM doesn't affect your SD card.

So I decided that it was time to figure out what was hogging my SDcard. I found a few files and directories that can be deleted without ill effect (at least as far as I can tell, I backed them up on my laptop just in case). So far I haven't deleted anything I use and I'm up to about 5 gigs free.

I'll post what I've found here, but I'm sure there's more. If you know of other directories, files, or apps that take up significant space and can be safely deleted, or other ways to free up space, put them into the comments and I'll try to update the OP. Also, try to figure out what the files are for and put that information in too.

***Warning: I am not responsible for deleting your important files, your backups, your homework, or your favorite picture of your cat. Everything in this thread has been tested by me or by at least 2 other forum users (hint, hint), but that doesn't guarantee that it won't set your tablet or your hair on fire. Use this guide at your own risk***

Big files that can be deleted:

mnt/sdcard/DCIM/.thumbnails/.thumbdata3-xxxxxxx

(Has something to do with a database of thumbnails. Deleting it has not had any effect on me, but I don't use my tab for photos. Mine was 124mb).

Directories that can have ALL files in them deleted:

mnt/sdcard/Android/data/com.amazon.venezia/cache/

(This is where the Amazon Appstore puts downloaded apks, including the daily free ones, and it NEVER gets cleared out. Mine was almost 2gb when I found it.)

mnt/sdcard/ScreenCapture/

(This is where all those screencaptures you accidentally took went. I've personally never intentionally taken a screen capture...)

Apps that can be deleted

Coming soon! (Haven't flashed Task's newest (v11) yet and I think he finally got rid of some of the garbage that I have to uninstall every time I flash... Will update this list when I do)

Other ways to save space:

Titanium backup: [preferences menu]

Backup app external data

(Allows you to choose whether you want to backup app data every time you do a Titanium backup. Serious reduction in the size of your backup, but with a pretty obvious disadvantage... Check the next option for something less drastic)

Select external data by max size

(Allows you to choose the maximum size of app external data backup. Default is to keep 32mb or smaller data caches. Most apps don't exceed that, but the few that do - like copilot - don't get backed up. I didn't mess with this one but)

Max backup history : set to "1"

(Sets the number of backup data "points." One is plenty unless you want double or triple backups)

Also, check this directory:

mnt/sdcard/Android/data/

This is where most app data goes. I found lots of stuff here that I didn't need any more. It's worth mentioning that this is where music you set as "offline" on google music beta is stored.

*Tip* Most of the subfolders are easy to identify as software you own, but sometimes you'll find that an app didn't uninstall properly and the data is still there!

Hope this helps! Please add your ideas for significant space savings in the comments.

**Update: So just after I originally posted this, Task650 started making a "slim" version of his ROM. Though none of the stuff above is affected, he's taken out many of the crappy Samsung programs and saved a lot of space that way. I usually had to use Titanium Backup to delete those programs with every new flash; now there's no reason to! I definitely recommend that ROM.

**Update 2: Just wanted to say "thanks" to the person (or persons) who voted this thread 5 stars. Also "thanks" to the person (or persons) who voted it one star. That's awesome of you.