Originally Posted by JH_man
Raid 5:
To make it simple you can say this work as raid 0, BUT and its a big but, this raid will also save controll data, meaning if one disk fails the system can still work (but slower). So you got time to swap the defect disk out, and your data is still ok. The minimum number of disks for this is 3, also with a 3 disk setup you will 'loose' disk space equal to 1 disk. So if you got 3 disks of each 100 gb, you will have 200 gb disk space. So the problem here for most home users its a bit costly solution, and that kind of data protection is normally not needed for home users.