$ ./hdparm -t --direct /dev/mmcblk0 /dev/mmcblk0: Timing O_DIRECT disk reads: 290 MB in 3.01 seconds = 96.47 MB/sec
$ ./hdparm -t --direct /dev/mmcblk1 /dev/mmcblk1: Timing O_DIRECT disk reads: 70 MB in 3.02 seconds = 23.21 MB/sec