RAID Recovery

"RAID" or Redundant Arrays of Inexpensive Disks systems are used by many businesses and corporations to ensure critical data integrity is maintained. Raid can be configured either using software or hardware. Hardware RAID uses a controller card to access the hard disks, while software uses the operating system to control the hard disk access. Hardware RAID is significantly more reliable and faster for data access, along with data read and writes. RAID arrays can fail for several reasons:

RAID is effective because it allows for redundant copies of data over multiple hard drives.

• RAID 0 is the only Hard Disk Raid Array that is not built with redundancy. Therefore, RAID 0 cannot afford to loose even one hard disk. (Hard drive).
• RAID 5 is designed to withstand failure of at least one hard disk without losing any data.

Rebuilding RAID After Hard Disk Failure

RestoreMyData can rebuild a RAID 0 caused by Hard Disk Failure, however, corrupted sections or physically damaged sectors holding data will not allow for a 100% complete RAID data recovery. The ability for a 100% Data Recovery from RAID 1 or RAID 5 systems are excellent.

Unfortunately, all RAID systems such as RAID 0, RAID 1, and RAID 5 are vulnerable to virus attack. RestoreMyData recovers data from all RAID systems that have been attacked by viruses or that have undergone physical hard disk damage or logical hard disk corruption.

RAID Failure

RAID controller's then allow access to a redundant copy of data in the event of a drive failure. Suppose you have RAID 5, with 5 hard disks connected to a RAID controller card. Now suppose hard disk 4 was corrupted or damaged. There would be no loss of data, however, the system would be running much slower. Often, this is a symptom that IT professionals recognize and initiate replacement of the "failed" hard disk in the RAID 5 disk array. If the replacement is not made and a second hard disk (hard disk 3) "fails", then your entire RAID system has Catastrophically FAILED. The RAID data recovery in this case is much more complicated and expensive.

RestoreMyData can recover data from a RAID-5 system just as sited in the case above, however, some hard disk data loss could be possible.

RAID systems achieve high capacity by using multiple disks. In addition, RAID systems utilize multiple disks to improve performance. Performance is enhanced by the type of RAID configuration being utilized.

RAID Performance

RAID 1 systems keep an exact copy of data on another disk, they can read a file much faster since they read different parts of the file from each disk. RAID 0 arrays improve read and write performance by converting the files into zero's and ones (bytes) and storing them over multiple disks.

RAID 0:

RAID 0 has no redundancy. If any drive in a RAID 0 array fails, then the RAID system has failed. The system will not be able to read or write files. Data recovery from the individual disks are possible. Since RAID-0 has no redundancy, the data on the failed hard disk is lost. RestoreMyData has the technology to recover the lost data and reconstruct the RAID 0 system and recover the lost data.

RAID 1:

RAID 1 is the simplest RAID configuration. It is also referred to as "mirroring". RAID 1 requires two identical disks of equal size. When data is written to a RAID 1 array, it is written to one disk and "mirrored" to a redundant disk. If one drive of the RAID 1 array fails, the system will still function accessing data from the redundant disk.

RAID 5 & Parity:

RAID 5 requires a minimum of three disks and is popular because it integrates the performance benefits of striping, redundancy and parity. Striping interleaves bytes or groups of bytes across multiple drives, so more than one disk is reading and writing simultaneously. Parity is a calculation that is utilized as an error detection technique to test the integrity of data on a hard disk. RAID 5 calculates parity as follows:

Bit from hard disk 1is XOR'd with a bit from hard disk 2. The resultant bit is stored on Hard Disk 3. It is the parity calculation that RestoreMyData uses to rebuild the data on the failed hard disk in the RAID 5 array.

Multi-Level RAID 0+1:

Multi-level RAID 0+1 combines the performance of RAID 0 with the redundancy of RAID 1. A RAID 0+1 array is constructed by taking a RAID 0 array consisting of two or more disks and mirroring the entire array to a different array consisting of an equal number of disks. When data is written into a RAID 0+1 array, it is first striped into one RAID 0 and then the Array is mirrored. Since RAID 0 has no redundancy, any hard disk loss from a RAID 0 will result in the loss of the contents on the "failed hard disk". RestoreMyData has the technology to recover the lost data and reconstruct the RAID 0+1 system to recover the lost data.

Multi-Level RAID 1+0:

Multi-level RAID 1+0 combines the redundancy of RAID 1 with the performance enhancements of RAID 0. A RAID 1+0 array is constructed by taking two or more RAID 1 Arrays and applying RAID 0 striping across these arrays. Data is written into a RAID 1+0 array, it is first split into stripes. Each stripe is written to one disk of each RAID 1 Array. The stripes are then mirrored individually to the other disk in the Array. If any disk from a RAID 1 Array fails, the system will continue to operate since the Array are "mirrored" and are redundant. RestoreMyData has the technology to recover the lost data and reconstruct the RAID 1+0 system to recover the lost data.

• When it comes to RAID recovery, we are the experts.
• RestoreMyData guarantees a successful data recovery!
• You can trust our New Jersey recovery labs will recover and rebuild your RAID system.

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