Over the weekend, we posted an in depth article on the ‘Other Storage’ issue prevalent on Windows Phone 8 GDR1 devices. The problem is that for some users that area fills up with a lot of data, often of an unknown origin, with no way to gain it back besides a hard reset. From 2 to 10 GB, users have had their data disappear and it prevents them from installing new apps or games due to the restricted size. Case in point, our Lumia 720 has 2.4 GB of Other storage, which can be severely limiting on a device where you only start with around 5 GB.
Two things need to be separated here before going forward: the bug and the architecture of the OS. It is true that with GDR1 devices (any phone below OS build 10327) there is a bug related to uninstallation of XAP files for app installation than can leave remnants behind. While for small apps, this is not a big deal, if you uninstall or download a trial of say NOVA 3 (1 GB) it can have a devastating effect on space.
But there is also the design of the OS. In other words Windows Phone 8 is meant to have some space occupied by Other storage as a way to cache frequently accessed media, graphics, app and game data for fast, offline loading. That’s not a bug but the architecture and it can’t really be “fixed”.