HOW TO Enable USB Mass Storage Mode in Samsung Galaxy S3

Samsung Galaxy S III is undoubtedly the hottest selling smartphone right now. The third phone of the Galaxy series, Galaxy S III packs in a plethora of new features on top of Android 4.0 Ice Cream Sandwich.

Unfortunately, this time, Samsung has decided to strip out support for USB Mass Storage mode in favor of MTP (Media Transfer Protocol) for some unknown reasons. The fact that MTP allows simultaneous use of data on the phone and PC could be a possible reason.

Steps to Enable USB Mass Storage Mode in Samsung Galaxy S3

Meet SGS3 Easy UMS app that enables USB Mass Storage mode in Samsung Galaxy S3. The app basically executes a command to make the external microSD card to be available as a UMS. This has been tested to work on Windows, but it may or may not work on other systems (Linux, Mac etc.).

This app requires your phone to be rooted. 

To enable USB Mass Storage on Samsung Galaxy S3, follow the given steps:
1. Download SGS3 Easy UMS app from the following link. It’s a tiny 8.8KB file:

Download: SGS3 Easy UMS

2. Transfer it to your phone using a data cable or Filepush app.
3. Launch the app and tap on the UMS mode button.
You will now be able to mount your external SD card as a removable disk on your PC. To revert back to MTP, simply tap on the MTP mode button in the app.

Credits for this creating this USB mass storage for Samsung Galaxy S3 app goes to an XDA Developers member, Kopfgeldjaeger.