Yeah, the S2 and phones from that era had a USB Mass Storage connection option. The main disadvantage of that was the need to divide Internal Storage into a small partition for app installation and a larger "internal SD" partition, which could be mounted to the computer like a hard drive, but this meant it would not be accessible by the phone during that time. This severely limited the size or number of apps you could install, due to the smaller size of the app installation partition. Around the time ICS came around, manufacturers started making the storage "unified," which gave you much more room to install apps, but didn't allow for USB Mass Storage. Instead, MTP allows you to see most user-accessible folders while still having the phone be able to access them as well.