Database Users

anyone who boot android frm sdcard pls read this

Sry but i have a question to ask
Does anyone successfully move ur installed apps to sdcard? I love dl ing games but the internal memory for my android built was only 0.99gb n i scared low memory will cause it laggy. I tried to move my apps to sdcard but it showed "failed to move " everytime!
Is this bcuz i nvr format my sdcard b4 booting? Or everyone has same prob?
Anyone who move to sd sucessfully? Wat version u using n how u do it? I m using phiremod skinnyevo, it is great
Pls help

Move2sd Enabler
omnia1994 said:
Sry but i have a question to ask
Does anyone successfully move ur installed apps to sdcard? I love dl ing games but the internal memory for my android built was only 0.99gb n i scared low memory will cause it laggy. I tried to move my apps to sdcard but it showed "failed to move " everytime!
Is this bcuz i nvr format my sdcard b4 booting? Or everyone has same prob?
Anyone who move to sd sucessfully? Wat version u using n how u do it? I m using phiremod skinnyevo, it is great
Pls help
Click to expand...
Click to collapse
Try "move2sd enabler" found that it moves the harder to move apps, also sets sd as default install.

Tried but no luck x(
How do i set that?

Move2sd Enabler
omnia1994 said:
Tried but no luck x(
How do i set that?
Click to expand...
Click to collapse
If installed correctly? ie "Superuser" rights, then go to settings>Applications>manage applications: select an application, you should now have the option to "move to sd card" Note that this does not work with all apps but certainly 80/90%. Future apps will be installed to your sd card automatically.
Good Luck

yup, still the same.
i using sdcard to boot android.. is this the prob i cant do this?

Move2sd Enabler
omnia1994 said:
yup, still the same.
i using sdcard to boot android.. is this the prob i cant do this?
Click to expand...
Click to collapse
Is Move2sd enabler visible in your superuser allow list?
Can you see the option to "move to sd card" in Applications manager?

my superuser allow list is blank
yes i can but it keep showing "failed to move apps" when i tried to move.. i ve tried almost all apps

omnia1994 said:
my superuser allow list is blank
yes i can but it keep showing "failed to move apps" when i tried to move.. i ve tried almost all apps
Click to expand...
Click to collapse
Move2sd should be in your allow list in superuser.
Uninstall move2sd and reinstall, it should prompt you for superuser rights, once granted you should be good to go.

a3r0n1 said:
Move2sd should be in your allow list in superuser.
Uninstall move2sd and reinstall, it should prompt you for superuser rights, once granted you should be good to go.
Click to expand...
Click to collapse
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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

man, now it even worst.
i uninstalled it, n when i trying to reinstall, it pops up "app cannot be install in the default location"

omnia1994 said:
man, now it even worst.
i uninstalled it, n when i trying to reinstall, it pops up "app cannot be install in the default location"
Click to expand...
Click to collapse
Check this install thread http://forum.xda-developers.com/showthread.php?t=720739

ta, i knew that's the thing, but i just failed to install after i uninstalled it.
btw, i m booting android from sdcard, so how do i root it? how can i do this?

it showed "app cant be installed in the default location"

[GUIDE]The ULTIMATE n00bs guide to the HD2-HardSPL, Android, ROMs, Radios and more!
omnia1994 said:
ta, i knew that's the thing, but i just failed to install after i uninstalled it.
btw, i m booting android from sdcard, so how do i root it? how can i do this?
Click to expand...
Click to collapse
omnia1994 said:
it showed "app cant be installed in the default location"
Click to expand...
Click to collapse
You need to "Hardspl" you'll find some answers here
http://forum.xda-developers.com/showthread.php?t=808015
http://forum.xda-developers.com/showthread.php?t=915628

i already have hspl since i using energy rom in winmo

Is your build rooted?

I m using phiremod evo
how do i check if it is rooted or not?

Hold on, hold on. You boot from the SD card yes? Then your apps are already on the SD card, in the form of data.img ON the SD card. If a 1GB data image isn't big enough, you can actually extend it and make more room, without losing anything.
You don't need app2sd.

thx.. how to i extend it?

Is it full? That's a lot of space to fill. I wouldn't extend it until you need to.
That said, I will explain. Please ensure you backup before hand, just in case. If anything goes wrong, I don't want blame, and I don't want you to lose data.
Boot Linux on your PC.
Boot Windows Mobile on your phone.
Copy data.img from your phone to your PC. MAKE A COPY OF DATA.IMG in case something goes wrong.
Mount data.img with a command such as:
sudo mount -o loop /home/[username]/Desktop/system.ext2 /mnt
Make data.img bigger by typing:
dd if=/dev/zero bs=1M count=X >> system.ext2
(Replace X with the size in MB you want to add. 100 would be 100MB.)
Then type resize2fs data.ext2
That's it. Copy the modified data.img back to your phone, and reboot into android.
If any of that is not clear, don't do it, or at least make sure you have backed up first.
I take no credit for this, this is all available on this forum, so credit where it's due.
I hope that helps.

[Script for IC_CM7] App move from NAND to ext Partiton

Hi,
i make a script to move Apps from /data/data to /system/sd/.moreapps
i use it with the Script Manager in CM7 InsertCoin
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"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
option a: for move data to ext Partition
option b: for move data back to NAND
option c: for rebuild previous moves"
( use this after wipe data )
the script search the 10 biggest apps on /data/data
this 10 apps you can move interactive
download move.sh

Can GScript Lite be used as app?

i dont know that, but script manager its free in the market.

umber said:
Hi,
i make a script to move Apps from /data/data to /system/sd/.moreapps
Click to expand...
Click to collapse
Thanks for good work.
But there is a general problem with this method introduced by baadnewz.
If you flash a rom update moved apps are not functional anymore.
Yes, you can move apps back to the nand before flash, but only if you have free space on nand to do that.
So I think a possible solution is a intelligent init.d script which recreates symbolic links on boot.

thx for your answer, you have this prob with a update from v23 to 24 ?

umber said:
thx for your answer, you have this prob with a update from v23 to 24 ?
Click to expand...
Click to collapse
I've done moving and linking of seven apps manually on v22. After that I flashed v22 again to test if it works, it don't.
One of the apps is still visible in the app drawer but won't start (asphalt), firefox working good , others are not visible in the app drawer.
Folders are there, I've recreate the symlinks, but they wont start.

hmm thats stange
i have mobed 3 apps and its work after:
-reflash v22
-flash v23 without wipe
-update to v24
after recreate symlinks your apps wont not work ?

Yes, they don't work. Don't know if this matters but I'm on standard hboot, not CM7.
I'll try your script.

hmm then you use the a2sd version, sorry but I can not test this, I will not change the hboot again

hi, i tried to run your script using script manager but it returns one line of code which is 'free space after change' and only .moreapps folder gets created in system/sd nothing is moved. I'm on ICv25 and i have s-off so i don't see where the problem is

you must call the script with the argument move
call for move:
Code:
sh move.sh move
Edit:
i have make a update, now when you start without argument, you become follow infos:
Code:
syntax wrong
call the script with Argument, move or moveback
sh move.sh move
sh move.sh moveback

sergmeister said:
hi, i tried to run your script using script manager but it returns one line of code which is 'free space after change' and only .moreapps folder gets created in system/sd nothing is moved. I'm on ICv25 and i have s-off so i don't see where the problem is
Click to expand...
Click to collapse
Same for me.
When I ran it through Script Manager with argument it shows:
"sh Can't open move.sh move"
Thanks for your support!
Update:
Through Terminal emulator script complete successfully.

look on the first post, this screenshot
thats the config for script manager.
-open script manager
-press menu -> browser
-search the script and select this
-then "open as" script
-configure, use the screenshot as example

umber said:
look on the first post, this screenshot
thats the config for script manager.
-open script manager
-press menu -> browser
-search the script and select this
-then "open as" script
-configure, use the screenshot as example
Click to expand...
Click to collapse
Yes, that's my setup but it doesn't work this way.

Finally got to my pc. Lets do a few tests. Time to sort the problems out.
A quick check of non working app after rom flash.
ln -s /system/sd/.moreapps/com.magicandroidapps.bettertermpro /data/data/com.magicandroidapps.bettertermpro
ln: /data/data/com.magicandroidapps.bettertermpro/com.magicandroidapps.bettertermpro: File exists
#
ls -al --color=none /data/data/com.magicandroidapps.bettertermpro
lrwxrwxrwx 1 0 0 55 May 11 20:12 /data/data/com.magicandroidapps.bettertermpro -> /system/sd/.moreapps/com.magicandroidapps.bettertermpro
#
So everything looking good, I've checked the files are there, but the app is "force close".
Lets install it again. App is installed in .moreapps dir.
First run is good. Second "force close".
What's going on I've no idea.
Moved back to nand another non working app.
Still doesn't work.
So there is data corruption on ext4. But why?
On same partition is app2sd and apps are running.
So let think for other reason.
Checked last installed apps. Link2SD.
Oh, sh*t. This app moves libs or apps on sd.
I've tested it for possible sollution for free space problem.
So this is the problem. This app installs a init.d script to mount ext partition.
After rom flash this script has to be installed again. Ok, remove links made by Link2SD and my goodness all moved apps are working again.
So let face the next problem.
I've preinstalled Script manager from starburst rom.
Uninstall. Install from market.
Strange! move.sh works with scrip manager as umber said.
Thanks umber and baadnews!

ah good news, the script it's very simple and it's based from baadnewz howto.
for me it's difficult to give support here, my english it's to bad
I am a bloody android noob, i can a little bit shell that's all.

thats the config for script manager.
-open script manager
-press menu -> browser
-search the script and select this
-then "open as" script
-configure, use the screenshot as example[/QUOTE]

update in first post, now you dont need arguments.

Modified just destination dir and used it with Oxygen 2.1.2.
Gained 80MB in first run by moving 9 apps.
Thanks!!

vr5411 said:
Modified just destination dir and used it with Oxygen 2.1.2.
Gained 80MB in first run by moving 9 apps.
Thanks!!
Click to expand...
Click to collapse
Hey,
I have recently switched from InsertCoin to CyanogenMod and miss this script very much. I just tried to modify the script and it doesn't quite work. My System partition is not on Ext so it just created a folder within System on my Nand.
What I tried was "Find and Replace" on:
Find - /system/sd/.moreapps
Replace - /sd-ext/.moreapps
The script doesn't work and I am running as root and the updated version. I've attached it to this post.
Can you help?

DTAPPS2SD

I have seen alot of people asking where to get dtapps2sd on various ROMS so I am posting a Link.
http://dl.dropbox.com/u/35700484/dtapps2sd-2.7.5.3-beta04-signed.zip
Instructions:
-Download dark tremors apps2sd and place it on the Root of your SD Card
-Boot your phone into Recovery
-Select Flash zip from SD
-Flash dtapps2sd-2.7.5.3-beta04-signed.zip
-Reboot Phone
-Open up terminal Emulator (if you dont have it get it from the market its free)
-In Terminal Emulator type SU hit Enter
-Type in a2sd reinstall, your phone will reboot
- *Optional* once rebooted you can go back into Terminal Emulator and type in SU hit enter and then type in a2sd datasd and let it run and reboot.
You will then notice a major difference in Internal Space.
If this has helped you all I ask is you please hit the thanks button

Green Bay!!!!!

Thanx dude

will this work on CM7

kendotelie said:
will this work on CM7
Click to expand...
Click to collapse
Yes
Edit:you have to partition your sd card for this to work
Sent from my PC36100 using XDA App

evo4gnoob said:
Yes
Edit:you have to partition your sd card for this to work
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
And make sure to back it up first or you will lose everything on it.

There's a dude over in the evo shift section who has a great a2ext patch. I really wish it could be ported over to the evo. But DT will have to do
Sent from my PC36100 using xda premium

Just dl'ed and ran script and it gave me 70 mb! Didn't need to partition sdcard.
Edit: I ran a benchmark and that increased from 959 to 1369! Forum rules won't let me post screenshot
Sent from my PC36100 using xda premium

Saints775 said:
Just dl'ed and ran script and it gave me 70 mb! Didn't need to partition sdcard.
Edit: I ran a benchmark and that increased from 959 to 1369! Forum rules won't let me post screenshot
Sent from my PC36100 using xda premium
Click to expand...
Click to collapse
Wow, I need someone with more knowledge than myself to explain this one to me.

Thanks for sharing...been using for a while and works great!

So I'm running dta2sd on evodeck. I've never had to restore a nandroid with dta2sd installation. I'm wondering if there's a different restore procedure? I would assume the following
1) restore nandroid
2) reboot
3) enjoy
But do I need to flash the dt script aftet restoring the nandroid backup ( I wouldn't think so since the nandeoid would include my current install of dt)?
Sent from my PC36100 using Tapatalk

Greubin said:
So I'm running dta2sd on evodeck. I've never had to restore a nandroid with dta2sd installation. I'm wondering if there's a different restore procedure? I would assume the following
1) restore nandroid
2) reboot
3) enjoy
But do I need to flash the dt script aftet restoring the nandroid backup ( I wouldn't think so since the nandeoid would include my current install of dt)?
Click to expand...
Click to collapse
I don't think so, the only thing I've found is that you'll want to make sure to include the SD-EXT as part of the back up if you're using Amon Ra.

tempe38 said:
I don't think so, the only thing I've found is that you'll want to make sure to include the SD-EXT as part of the back up if you're using Amon Ra.
Click to expand...
Click to collapse
And if you do partition your SD card before running the script, you won't be able to restore a non-partitioned nandroid. Don't know exactly why, but that's what I've read in other forums.
Sent from my Evo 4G running Decks ICS Alpha 2.

Here is a well written guide to setting up a2sd.
http://therootofallevo.com/2011/04/10-step-guide-properly-set-darktremors-a2sd/
I have a class 4 sandisk SD and using the beta4 of dta2sd i have 436mb free on my internal storage and no lag using the set up in in my signature

evo4gnoob said:
Yes
Edit:you have to partition your sd card for this to work
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
sorry for the noob ?, but i read the info, sound simple, but then its this partition part? why can i just use an app like app 2 sd pro? or just flash and use this tut, like everything else, what benefits i'll get from partition and non-partition SD

Keyz450 said:
sorry for the noob ?, but i read the info, sound simple, but then its this partition part? why can i just use an app like app 2 sd pro? or just flash and use this tut, like everything else, what benefits i'll get from partition and non-partition SD
Click to expand...
Click to collapse
A2sd sort of tricks your phone into thinking that the partition is part of the internal memory
Sent from my PC36100 using XDA App

Not to brag buuuuut...
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
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"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
(W/ 23 apps installed)
Sent from my PC36100 using XDA App

jayshocka said:
A2sd sort of tricks your phone into thinking that the partition is part of the internal memory
Read the guide I posted a few up. Also allows for apps that can't be put on SD by a2sd pro
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Sent from my PC36100 using XDA App

Ooooooooooops
Sent from my PC36100 using XDA App

coffeehandle said:
Not to brag buuuuut...
(W/ 23 apps installed)
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
133 apps installed.... How do you have 700+ internal memory?
Sent from my PC36100 using XDA App

app2SD wit AMARULLZ

Requirement:
Bootloader unlock
doomskernel
Create ext4
Download 40ad2sdx from
http://forum.xda-developers.com/showthread.php?p=18561098
extrack put in folder adb
remove other app2sd I recomended flash again Xperia play n Domskarnel
Then Install 40ad2sdx From recovery
then Fix permision in cwm recovery
Advance-fix permision then reboot
if Network mobile not detected enter recovery again and fix permision
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"lightbox_previous": "Previous",
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}
Recomended
Edit : No Need Fix Permissions
Karnel DooMLoRD Kernel (v11) with wifi Module V.08
ROM GIN2ICS in here
Base R800i 4.0.2.A.0.58 Enhanced

Ok, how's this any different from Darktremor's App2SD?

More info please. Like which firms will this work on etc etc does it work on latest .62
Sent from my R800i using xda premium

zamrong said:
Requirement:
Bootloader unlock
doomskernel
Create ext4
Download 40ad2sdx from
http://forum.xda-developers.com/showthread.php?p=18561098
extrack put in folder adb
remove other app2sd I recomended flash again Xperia play n Domskarnel
Then Install 40ad2sdx From recovery
then Fix permision in cwm recovery
Advance-fix permision then reboot
if Network mobile not detected enter recovery again and fix permision
Click to expand...
Click to collapse
Thanks for the heads-up. I'll test this out tonight.
Magnumutz said:
Ok, how's this any different from Darktremor's App2SD?
Click to expand...
Click to collapse
bearusa said:
More info please. Like which firms will this work on etc etc does it work on latest .62
Sent from my R800i using xda premium
Click to expand...
Click to collapse
Check the link posted by the op. Everything is explained in that thread.

Ok, i read and this is awesome! Especially for those with 16+GB SD.
Now... has anyone successfully installed it?

Installed & it works great! I now have 3GB "internal" space from /sdext. The true /data is mounted as /sdext & the ext4 partition on my sdcard is mounted as /data

Downloading, will test it
edit // I install it and fix permission, have error wit connecto to network, so reboot again into cwm and fix permission but it won't work

is it possible to use it with stock kernel. Cant flash doomlords kernel... can only boot up with it.

evo_racer said:
Downloading, will test it
edit // I install it and fix permission, have error wit connecto to network, so reboot again into cwm and fix permission but it won't work
Click to expand...
Click to collapse
INSTALL IT then reboot let it go into sytem
then power of & enter to recovery again and fix permission then reboot
sory my english language is bad...

Can anyone make a clearer info? The steps? Please and thank you.
Sent from my R800i using XDA App

Cant get it to work unlocked bootloader stock rom with doom kernel v10. Flashed generic uk 42 rom using flashtool. Installed dooms kernal v10 without boot. Straight go into recovery. Flashed the recovery zip version. Boot up... after sony logo, hangs at blue screen with no network svc. Cant move on. Reboot same issue. Cleared data n wipe cache same result. Help pls
Sent from my R800i using xda premium
*edit* its done yeah

Finally, i got my 32GB microSD and installed Amarullz's app2SD.
Works like advertised
Later edit: Can this tweak increase my microSD's write/read speeds?
Cuz my ADATA class 4 32GB has the following results: http://img546.imageshack.us/img546/1396/sonyericssonr800i201202.png

Ok, this is working just nice, but i have to keep fixing permissions for every reboot, in order to have GSM network signal.

Does this work on the fxp cm7.2 kernel?

crono141 said:
Does this work on the fxp cm7.2 kernel?
Click to expand...
Click to collapse
Wondering as well. I only see users with a R800x try and have bugs...
I might try it with Hogwarts cola from later
Sent from my R800x using xda premium

I just wiped and reflashed tweaks rom version 5.
updated to doom kernal 11, installed wifi zip.
booted phone, set up wifi, and apn.
follwed this step,
Code:
C:\>adb push 40ad2sdx /system/etc/init.d/
C:\>adb shell
# cd /system/etc/init.d
# chmod 755 40ad2sdx
# cd /
# umount /system
# exit
Rebooted phone 2 times, fixed permissions a few times but still almost every app force closes.
Can someone who has this working write up a full step by step guide and what order to to all the steps?
Thanks
Oh yeah, i have an xperia play gsm.

Partioned my SDcard with EXT 4.Then selected all the fourth options ,SDgot wiped,put the mod onto my SDC and
nothing happened -_-

You have to flash it, not only put it on your sdcard...

All right. Find out here :
http://forum.xda-developers.com/showpost.php?p=21195341&postcount=207
Skip the first two rows of posts.
Works well for me...

Sorry for noob question.
But could someone please explain how to fix permissions in CWM?
When i try fix_permissions in ADB Shell, i always get "/sbin/sh: fix_permissions: not found". Is my Phone missing a file or is my shell missing a file? How to solve this problem?
Thanks in advance

What is 'system data'?

Can any one shed some light on what system data is on my N4s storage?
I assumed it was the os but that's partitioned and I then have the 5.8gb that's available...
Thanks!
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"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
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"lightbox_stop_slideshow": "Stop slideshow",
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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Sent from my Nexus 4 using xda app-developers app

Most likely the OS.
Sent from my Nexus 4 using Tapatalk 2

The OS takes up part of the 8gb to leave me with 5.8 though.. Anyone else?
Sent from my Nexus 4 using xda app-developers app

adaimespechip said:
The OS takes up part of the 8gb to leave me with 5.8 though.. Anyone else?
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Are you using CWM and if you do, what version are you using?
When I just got the phone, I had the same problem as you after I install a buggy version of CWM. Basically CWM made a backup to some folder that there's no way for you, CWM, or the system to tell where the heck it is.
I got rid of that by restoring my phone to stock then started using TWRP (try it, you'll like it)
Edit: Also, look at /data instead of /sdcard
/sdcard is an emulated folder, /data is more accurate since it's where stuffs are actually stored.

thats HUGE for system data. i only have 270MB used for it

Yeah I did but that was so long ago.. It could be that I guess. You suggest erasing the whole thing and restoring my apps?
Sent from my Nexus 4 using xda app-developers app

Well, I got that back in CWM 6.0.1.6, which is like a month a go. A life time for the Nexus 4. There is a way to trace these folders using ADB, but I wiped my entire phone before I read the post so I don't know if the method works.
What I did was wiping everything (including system) then restore to stock. It was a little bit overdone, I guess restore to stock would do the trick. Just remember to back up /sdcard to your computer.
Edit: I was so annoyed by that wasted 1.7MB that I basically nuked the phone lol
bassmadrigal said:
If you are rooted and have adb set up on your computer, you can find out what folders are using the most space by using the commands below, then change into that directory and run the command again.
Code:
adb
su
cd /
du -hd 1
--find the largest folder and change directory (cd) into it - if you find you no longer want to continue in the folder you are in, you can cd .. to get to the previous folder or cd / to get back to the root of the filesystem--
Code:
cd large_folder
du -hd 1
rinse
repeat
????
profit
This will allow you to find what folders are using the most space and can eventually lead you to any large files and can then let you find out if you can delete them or if you need to keep them.
Click to expand...
Click to collapse

What application are you using to get that information?
Sent from my Nexus 4 using Tapatalk 2

netsyd said:
What application are you using to get that information?
Sent from my Nexus 4 using Tapatalk 2
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DiskUsage 3.4
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mariosraptor said:
DiskUsage 3.4
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What he said - one of my must have apps..
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KyraOfFire said:
Well, I got that back in CWM 6.0.1.6, which is like a month a go. A life time for the Nexus 4. There is a way to trace these folders using ADB, but I wiped my entire phone before I read the post so I don't know if the method works.
What I did was wiping everything (including system) then restore to stock. It was a little bit overdone, I guess restore to stock would do the trick. Just remember to back up /sdcard to your computer.
Edit: I was so annoyed by that wasted 1.7MB that I basically nuked the phone lol
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Thanks! Will try when I'm back home!
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Okay no luck - Have totally reset the device and still have 1900mb of system data showing....
EDIT: Fixed - Flashed new CWM recovery and it WAS a backup i'd taken weeks ago.. deleted it and now have 200mb system data.

adaimespechip said:
Okay no luck - Have totally reset the device and still have 1900mb of system data showing....
EDIT: Fixed - Flashed new CWM recovery and it WAS a backup i'd taken weeks ago.. deleted it and now have 200mb system data.
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So is it safe to assume that the space is from backups? I posted my situation here

There didn't seem to be a clear answer here so :
System data is the space taken up by files outside of the special sdcard directory.
Android is treating the emulated SD card as being 8Gb/16Gb (- the hidden partitions) and not taking into account space taken up by files outside of the special directories.
In the Settings > Storage screen you will also notice that the free space and used space do not add up, this difference is the 'system data'.
Apps from Google and those with root access commonly write to directories outside of the sdcard.
Google Music is particularly guilty of taking up space without reporting it properly, from the Settings > Apps menu you can see how much space the music application is taking up, and clear it if desired.
Backups are also likely to be eating a large amount of that space, from CWM or TWRP or another source.
These are outside of the sdcard to prevent you from accidentally deleting them.
They can normally be move/removed from within the application that made them, or with a root file manager.
You probably want to keep some working backups, I generally store them on a cloud service or external disk with only the latest on the phone.
You will not get the 'system data' down to 0 as some space is for actual system files, you should be able to get it below 500Mb easily, or just be happy once you know where the space has gone.
I hope that helped.