Nope, by default the M3 tries to start from the only reasonable media you still ignore: the fast internal eMMC. To get an idea how wrong it is to use the ultra slow GL830 USB-to-SATA bridge, install iozone (apt-get install iozone3) and compare using
iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2(tests with a few different record sizes). The eMMC is several times faster than anything connected to the crappy GL830:
random random
kB reclen write rewrite read reread read write
102400 4 4378 2626 5659 7929 8329 5106
102400 16 13302 13674 27495 27399 26636 13430
102400 512 22770 23383 54337 54592 52669 23046
102400 1024 23582 23381 60522 61165 61159 23364
102400 16384 24577 25005 72832 72809 72435 25216