I created a disk image with dd. The hard disk capacity is 2 GB. However, the image produced a 3.8 GB file. I used:
dd if=/dev/mmcblk0 > /mnt/sd/disk0.img
(where mmcblk0 is a microSD card, with 3 partitions: 2 ext3 and 1 FAT32).
How can I test if it is done correctly?