Default [Q] How to dump pit file?

Can someone tell me how to dump pit file from Samsung Galaxy SIII GT-I9300 16GB Android 4.3 stock ROM? Somewhere I have seen how to dump using the command line:
dd if=/dev/block/mmcblk0 of=/sdcard/pit.bin bs=4096 count=1 skip=4 but at the end I got a pit file of the size greater than 1GB. So I believe it can't be that big. Please help. Thanks in advance

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