Check and test the integrity of SD cards before you use them. Cheap SD cards purchased online are sometimes faulty. Make sure they work properly before you rely on them. This program can also test the speed of the card, to make sure that the its speed matches with the advertised speed or class of the card. Can be used to test any kind of disk, to ensure proper functioning and speed. Don’t be ripped-off by the fake sd cards and flash memory sticks that are commonly sold on ebay or other places online.