Is it possible to fully copy an SD card (including the MBR)? - copy

Question

I have an SD card that I use in my Raspberry pi configuration, and I recently purchased a bigger card.
I'd like to avoid to re-install the os (OpenElec) and to transfert all the files already present (almost 60Gb), but to do something like dd from the sdcard to my local disk, then do an other dd from my local disk to the new sdcard and that's it.
Is it possible?
Plot twist, I'm on MacOS (but I believe that for that kind of work, it's quite similar to Linux, I'm not afraid of command line).
Thank you for your help.

Answer 1

To find the drives, their partitions and device special file names on a Mac, you would run this in the Terminal:
diskutil list
Sample Output
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 3.0 TB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Macintosh HD 121.0 GB disk1s2
3: Apple_Boot Boot OS X 134.2 MB disk1s3
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +3.1 TB disk2
Logical Volume on disk1s2, disk0s2
EF247607-3049-4EF0-8DFB-35B7ED84B7C0
Unencrypted Fusion Drive
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *12.0 TB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_HFS SystemClone 3.0 TB disk4s2
3: Apple_Boot Recovery HD 650.0 MB disk4s3
4: Apple_HFS OldMachine 550.0 GB disk4s4
5: Apple_HFS Spare 1000.0 GB disk4s5
6: Apple_CoreStorage TimeMachine 7.4 TB disk4s6
7: Apple_Boot Boot OS X 134.2 MB disk4s7
8: Apple_HFS Untitled 251.5 MB disk4s8
/dev/disk5 (external, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS TimeMachine +7.4 TB disk5
Logical Volume TimeMachine on disk4s6
C7E53345-5059-45D8-826C-B10B6F16AD20
Locked Encrypted
Then very carefully select which ones have the right size and filesystem to match your SD card for input from and output to. Then use the entire disk name (rather than any slices which end in sN like /dev/disk5s2 ) to get the MBR:
sudo dd if=/dev/disk5000 of=/dev/disk5001 bs=65536
The <disk5000> above is a placeholder for the real name as I do not want to trash anyone's disk who is daft enough to copy/paste my example without checking it matches their system.