RAID 0,1, and 5
Information Page

hard driveIf you think your RAID array is failing or has gone off line please use caution! Forcing a RAID array back on-line after a failure is almost never successful and frequently results in the permanent loss of data. Please read our article on RAID Backup Procedures. and then call Data Recovery Link at 800-625-6451. We can recover your data even after others have tried unsuccessfully.

Understanding RAID 0, 1, and 5 Arrays

A RAID 0 (also known as a stripe set) divides the data evenly across two or more hard drives with no parity information for redundancy. RAID 0 does not provides redundancy in any way so it’s not a recommended configuration unless the data is backed up or is of no value such as swap file drives or cache areas. RAID 0 is ideal for performance configurations. It is also good when a large volume is needed with few disks. A full recovery from a RAID 0 is not possible if any one of the drives in the array becomes damaged or has an unrecoverable mechanical failure. All drives are needed because the data is spread evenly across all disks.


A RAID 1 is where two hard drives are created as exact duplicates or “mirrors” of each other. A RAID 1 is useful when server uptimes are critical and speed is less of an issue. Because each disk drive contains the same data as the other, storage capacity is equal to the size of the smallest disk in the set. RAID 1 arrays are the preferred configuration for companies that require sustained up times with little risk of corruption and high recoverability if the RAID array fails. The data recovery process for a RAID 1 is the same process as a single hard drive data recovery and has a higher success rate than a single disk drive recovery.


RAID 5 arrays use parity striping that is distributed among all disk drives in the array. A RAID 5 array configuration is the most popular configuration among RAID users due to its high performance, built in redundancy and low cost for the storage capacity it provides. A RAID 5 is generally used when the maximum performance is needed for reads and writes and built in data redundancy is a must. A minimum of 3 disks are required to configure a RAID 5 array. When one drive in the array fails it is possible to replace the failed drive, rebuild the data onto the new drive, and experience no down time to the end user. The process where a drives is replaced while the server is running is called a hot-swap. The data recovery process is usually very difficult yet highly successful on a RAID 5 due to the striping across multiple drives. This success rate is due to the built in data stripe that can be used to recover the data that was on the failed drive .


Data RecoveryData Recovery Link is one of the nation’s leaders in hard drive and RAID 5 data Recovery. We have been successfully recovering data from failed RAID 5 arrays for years with a 99% success rate. Data Recovery Link has been in business and has been performing RAID data recoveries for many years and our courteous staff will help guide you through the data recovery process.