How to change a faulty drive in UNRAID
A lot of people use UNRAID. If you don't you're seriously missing out.
UNRAID is a software solution for a NAS that can be used on any commodity PC parts. The beauty of UNRAID, unlike traditional RAID systems is that you do not need to use drives of the same size. For home users this is absolutely amazing and you can easily scrounge up drives and add them to the array when needed or when there is a sale on drives.