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 RAID 4 - Dedicated parity drive

RAID 4

RAID 4 improves performance by striping data across many disks in blocks, and provides fault tolerance through a dedicated parity disk. It is better suited to transaction I/O rather than large file transfers. Going from byte to block striping improves random access performance, but the dedicated parity disk remains a bottleneck, especially for random write performance. This is why RAID 4 has worst write transaction rate and write aggregate transfer rate. Level 4 is seldom used without accompanying technologies such as write-back caching. Fault tolerance, format efficiency and many other attributes are the same as for RAID 3 and RAID 5.

See other RAID arrays below:

 RAID 0 - Striped disk array
 RAID 1 - Mirroring and duplexing
 RAID 2 - Error-correcting coding
 RAID 3 - Bit-interleaved parity
 RAID 4 - Dedicated parity drive
 RAID 5 - Block interleaved distributed parity
 RAID 6 - Independent data disks with double parity
 RAID 7 - Adds caching to levels 3 or 4
 RAID 10 - High reliability combined with high data performance
 RAID 50 - High I/O rates and data transfer performance
 ZFS RAID - RAID type used by FreeNas and other units
 X-RAID - RAID type found in Netgear and other RAID units

For pricing information or questions about RAID 4 data recovery please call 1-888-307-3676.


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