RAID 0:
- Performance-driven level.
- Stripes data across the drives to combine total read/write speed.
- Doesn’t protect against drive failure.
RAID 1:
- Backups data on each disk.
- Slower than others.
RAID 5:
- Stripes data to 3 drives minimum.
- Parity data in all drives.
- Less chance of failure.
RAID 6:
- Stripes data to >4 HDDs.
- Double parity.
- You can afford two HDD failures without data loss.
RAID 10:
- Requires at least 4 HDDs.
- Combined read speed of entire drives and write speed of half of them.
- Better writing speed in smaller arrays.
RAID 50:
- Combination of multiple RAID 5s with RAID 0.
- Combined read speed of all drives and write speed of the raid 5s combined.
- One drive failure in each RAID 5 can be tolerated.
RAID 60:
- RAID 6s with RAID 0 combined.
- Combined read speed of entire drives and write speed of individual raid 6s.
- You can afford two drives fail in each RAID 6 without data loss.