Disk Mirroring

Hardware will always be better then OS based mirroring.

There is less overhead since the mirror is taking place at the controller level. Plus recovery from a disk failure is easier. Unlike windows mirroring where you have to edit the boot.ini file, break the mirror, reboot, put in another drive then recreate the mirror again.

Very rarely will I ever use windows based raid. The exception to this is on a non-critical data drive where I can care less if the data get's destroyed, and I don't want to buy an additional controller.

you will need at least 2 harddisks and both needs to be upgrade to dynamic disks. Where under disk management you will be given the option to create mirroring.