How much disk space does Android OS 4.1.1 take? I recently received a Samsung Galaxy Tab 2 7.0 with Android 4.1.1 on it. This is the 8GB model. I am curious to know, how much disk space does the Android OS take up? I did not think about 3.5GB was needed for the OS. Is this true? I ask only because my disk space available says I have 4.49GB left.
There's a difference between "how much the Android OS requires" and "how much the manufacturer reserved". Remember, the OS has its own partition (/system), which is mounted read-only during normal operation (just made writable for OS updates), while the user's data goes to /data. Moreover, most manufacturers add their own "presents" (also known as bloatware) to the /system partition.

So while the actual Android system usually fits into less than 1 GB (considered there are devices shipping with less internal storage), your device's manufacturer might have decided to reserve more space for future updates and his own add-ons.