 How to convert a USB drive, a memory card, or an external hard disk from one file system into another and back? Right-click on the disk to be converted, select Format, specify NTFS as the desired file system, and the cluster size if necessary. Set the volume label if necessary, the Formatting method, and click Start. To keep data out of converting, let's use another method with a command prompt. To do it, go to the command prompt as an administrator, enter the command cmd, and then enter the following command. Set the volume label, and press Enter again, and the converting process starts. If your flash memory card has the XFAT file system, use the Free Utility MMA Partition Assistant. To convert the card, right-click on it, Format Partition, select the file system,