New answers tagged 2.1-eclair
Z4root was a very nice simple app (at least, v. 1.3.0 worked for SGS on Froyo 2.2), but after I upgraded Samsung Galaxy S to Gingerbread (2.3.5), this rooting method became nonfunctional. The phone can be rooted with SuperOneClick though.
You can also free space when you move the dalvik-cache to the sd-card. The problem is that android uses a cache for the applications effectively double the occupied space in the data partition. Together with link2sd it can be very effective.
I don't know how much the installed size of the app is. But considering how the install process works, the explanation might be easy: the .apk is downloaded to /data/local (internal storage) for installation, it might require some unpacking, with temporary files again being created on internal storage only after that, the app will be stored to its final ...
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