My Zyxel NSA325 currently has a 60GB SDD as the boot (left) drive.
The first partition is 24 MB ext2 labeled “boot”.
The second partition is 32GB ext4 labeled “rootfs”.
The third partition is the rest of drive.
The second drive is a 4TB Seagate with the same partition structure (I can boot from it if I put it in the left slot).
I can manually run
Hdparm –S 180 /dev/sdb
However, this must be done after each reboot