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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?

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Do you get the same result with dd if=/dev/mmcblk0 of=/mnt/sd/disk0.img? – jaume Mar 4 '13 at 10:18
Just to disconfuse me ;) mmcblk0 is not mounted to /mnt/sd?! – mpy Mar 4 '13 at 10:28
Do you mean partition by "hard disk"?… – Ярослав Рахматуллин Mar 5 '13 at 5:37

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