mount /dev/mmcblk1p7 /mnt
dd if=/dev/zero of=/mnt/tmp.bin bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 190.568 s, 22.5 MB/s
dd if=/mnt/tmp.bin of=/dev/null bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 204.904 s, 21.0 MB/s
dd if=/dev/mmcblk1 of=/dev/null bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 202.128 s, 21.2 MB/s


mount /dev/mmcblk0p7 /mnt
dd if=/dev/zero of=/mnt/tmp.bin bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 40.8296 s, 105 MB/s
dd if=/mnt/tmp.bin of=/dev/null bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 37.9061 s, 113 MB/s
dd if=/dev/mmcblk0 of=/dev/null bs=1M count=4096
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 36.7177 s, 117 MB/s