I was also checking for this "Other" category behavior a bit on my HTC 8S. Here's the results! This is done to the CLEAN (or "factory set") phone.
Resetting factory setup.
Clean state:
Music + videos 0 bytes
Pictures 0 bytes
Apps 83,30 Mb
Other 282,98 Mb
System 2,02 Gb
Free space 1,23 Gb
Checked backup, opened "What will get backed up?" link and opened IE first time, then went right back *without* loading any setting or page (back + back). Difference after this:
Music + videos -
Pictures -
Apps 83,29 Mb
Other 311,68 Mb
System -
Free space 1,20 Gb
Letting phone just "sit" for a 10 mins with Me- and People-livetile running. Difference:
Music + videos -
Pictures -
Apps -
Other -
System -
Free space -
Manually sync'd and read 5 emails. Difference:
Music + videos -
Pictures -
Apps -
Other 312,21 Mb
System -
Free space -
Opened IE from last known page (the one that opened in earlier step). "Read" whole page from top to the bottom. Went back to Metro-screen. Difference:
Music + videos -
Pictures -
Apps -
Other -
System -
Free space -
Opened IE again and went to
The Smartphone Reinvented Around You | Windows Phone (United States) and signed in. Back to Metro, and then checking storage difference:
Music + videos -
Pictures -
Apps -
Other 317,52 Mb
System -
Free space 1,19 Gb
Back to Metro, then IE, straight to YouTube and clicked first possible ~4 min video on sight and watched it in HQ. Then head back to Metro, All apps, Settings, Storage. Difference:
Music + videos -
Pictures -
Apps -
Other 318,43 Mb
System -
Free space -
Now to clear every history in phone. Went to applications page of settings and wiped every single history this way. Difference:
Music + videos -
Pictures -
Apps -
Other 322,59 Mb
System -
Free space -
Now restarting phone. Checking the difference:
Music + videos -
Pictures -
Apps -
Other 317,82 Mb
System -
Free space -
First app download & install. Store -> Search "SkyDrive" -> Download & Install. Difference:
Music + videos -
Pictures -
Apps 89,96 Mb
Other 329,23 Mb
System -
Free space 1,18 Gb
On the same run I also uninstalled that app and restarted phone. Any difference?
Music + videos -
Pictures -
Apps 83,29 Mb
Other 322,30 Mb
System -
Free space 1,19 Gb
Just letting this phone sit for a while, approx ~10 mins and checking again if idle time affects.
Music + videos -
Pictures -
Apps -
Other 322,27 Mb
System -
Free space -
Now I linked Facebook this way: People -> Settings -> Add an account. I did NOT link it with Microsoft account. What difference it made?
Music + videos -
Pictures -
Apps -
Other 348,93 Mb
System -
Free space 1,16 Gb
Ok. That ate ~24 Mb's after full sync. Now I checked my People-tile and looked "What's new", scrolled down for a one load and now my storage shows me:
Music + videos -
Pictures -
Apps 83,28 Mb
Other 349,33 Mb
System -
Free space -
Interested in a phone restart I am and I will. First one lock screen, then restart. After lock screen, before restart:
Music + videos -
Pictures -
Apps -
Other 349,37 Mb
System -
Free space -
After restart:
Music + videos -
Pictures -
Apps -
Other 349,67 Mb
System -
Free space -
Now I checked Me-tile and took out "Notifications". It loaded bunch of new stuff and my storage info tells me this:
Music + videos -
Pictures -
Apps -
Other 344,25 Mb
System -
Free space 1,17 Gb
Back to metro.
I'm a bit keen to know how this system actually works. It lives, but differences are not too notable. I might be doing this type of comparison later with "backed up" settings and stuff, so I can have a bit wider view about this as a whole.