RAID LEVEL 4: Block Level Striping with Dedicated Parity Disk

RAID 4 consists of block-level striping with a dedicated parity disk. Parity for same rank blocks is generated on Writes, recorded on the parity disk and checked on Reads.
RAID 4 requires at least 3 drives to implement.

Characteristics & Advantages

  • Very high Read data transfer rate
  • High random read rate
  • The ratio of Parity disks to data disks is low, which means higher efficiency


  • Controller design is fairly complex
  • Worst write transaction rate
  • Data rebuild is difficult and inefficient during disk failure

Recommended Applications

  • Video Production and live streaming
  • Image Editing
  • Video Editing
  • Prepress Applications
  • Any application requiring high throughput