Just go to the file manager from the main menu. Choose directory. When asked for drive, space down to the drive you want to check. Flash disk for instance. When you space down to flash disk, press i with space. You will hear the amount of characters free and used. Divide that number by 1000000 to get the amount in megabytes. You can do the same procedure with folders. After spacing down to the drive, press enter to open the drive. Space down to the folder/directory and press space with i.
Dan Kelley
