Operating Systems · Storage and I/O

Redundancy and RAID

Spreading or duplicating data across multiple disks so one drive failing doesn't lose data.

Also known as: RAID levels, disk mirroring, disk striping.

Start a lesson on Redundancy and RAID

Learn first

• Hard disks and SSDs: How spinning disks and flash storage actually store and retrieve data, and why their performance shapes differ.

Related topics

• File system implementation: How a real file system, FFS, FAT, NTFS, lays out inodes, directories, and data blocks on disk.