Not only it doesn't depend on the ordering of SATA cables but it also ensures you don't delete drive on the wrong machine. If you
dd if=/dev/zero of=/dev/sda, you better be sure you're on the correct machine. On the other hand, if you run
dd if=/dev/zero of=/dev/diskid/DISK-SERIAL-123 on the wrong machine, you will just see an error telling you the device was not found. Much better.
But I don't have
/dev/diskid/, I hear you complain. XigmaNAS, as pretty much any FreeBSD system by default needs a slight modification to track disks this way.
To turn it on, go to
loader.conf tab. There add
kern.geom.label.disk_ident.enable=1 and reboot. Once system has started again, all your disks will have their entry in