A free app for Android, by Sylkat.

This is a handy utility that allows you to create, manage and repair SD cards on your Android device. The AParted program provides valuable tools for managing and maintaining your USB or memory card. You can get it functioning by adding more RAM, fixing bugs, and verifying that everything is running smoothly. This is not a toy; improper use could result in losing all data stored on the memory card. Please refrain from using it unless you are an adult computer expert. The manufacturer assumes no responsibility for damage caused by improper usage of an SD card. Additionally, the app requires mobile rooting prior to usage.