RAID 5:
Stripped Data Disks
with Distributed Parity Blocks

Significantly reduce your chances of loosing information on your hard drive — use this well thought out technique.

By using three or more hard drives you will have a safety net in case one goes bad.

Each entire data block is written on a data disk; parity for blocks in the same rank is generated on writes, recorded in a distributed location and checked on reads.

CHARACTERISTICS and ADVANTAGES	DISADVANTAGES
• Highest read data transaction rate • Medium write data transaction rate • Low ratio of ECC (parity) disks to data disks means high efficiency • Good aggregate transfer rate	• Disk failure has a medium impact on throughput • Most complex controller design • Rebuilding a disk failure requires special software and time • Individual block data transfer rates are the same as single disk transfer rates