Difference between RAID 3 and RAID 4

1. RAID 3:
RAID 3 consists of Byte-level Striping. It stripes the data onto multiple disk. The parity bit generated for each disk section and stored on a different dedicated disk. This level overcome the single disk failure.

Advantages –

1. Data can be transferred in bulk
2. Data can be accessed in parallel.

Disadvantages –

1. It require an additional drive for parity.
2. In case of small size files it performs slowly.

2. RAID 4:
RAID 4 consist of Block-level Striping. In this level entire set or block of data written onto the data disk and then the parity is generated and stored on a different set of disk. This level overcome at most one disk failure. If more than one disk failure occur then there is no way to recover the data. Both RAID 3 and RAID 4 require at least three disk to implement RAID.

Advantages –

1. It facilitates simultaneous I/O request because of Block striping.
2. Storage overhead is low.

Disadvantages –

1. Parity disk may lead to bottleneck.
2. Slow random writes because of separate block parity.

Difference between RAID 3 and RAID 4 :

SR.No.	RAID 3	RAID 4
1.	RAID 3 stands for Redundant Array of Independent Disk level 3.	RAID 4 stands for Redundant Array of Independent Disk level 4.
2.	In RAID 3 technology, Byte-level Striping is used.	In RAID 4 technology, Block-level Striping is used.
3.	In this level, parity bits are generated for each disk section and stored on a different disk.	In this level, parity bits are generated for the entire block of data and stored on a different disk
4.	Random read will have worst performance.	Good Random reads, as the data blocks are striped.
5.	Performance is good in case of large sized files.	Performance is low because only one block is accessed at a time

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