RAID 1 vs RAID 5: Key Differences, Speed & Redemption Explained
RAID 1 mirrors two identical drives, giving you one full backup copy. RAID 5 stripes data and parity across three or more disks, surviving any single-disk failure while using space more efficiently.
Home-lab builders love RAID 1 because it feels safe: unplug one drive and everything still works. They hesitate over RAID 5, fearing the scary “rebuild” stories, yet they crave its extra terabytes. Speed or safety? That’s the daily tension.
Key Differences
RAID 1 doubles reads, writes at single-disk speed, and wastes 50 % capacity. RAID 5 reads fast, writes slower due to parity, wastes only one disk’s worth, and tolerates one loss—no more.
Which One Should You Choose?
Pick RAID 1 for two-drive desktops needing dead-simple recovery. Pick RAID 5 when you have three-plus disks, need space, and can handle nightly backups to cover a second failure.
Can I add drives later?
RAID 1: no. RAID 5: yes, though risky; backup first, then expand.
Does RAID replace backups?
Never. RAID survives disk death; backups survive fire, theft, and ransomware.