Hard Drive Data Recovery

With the cost of the hard drive down, it is not uncommon for desktop PCs at home for RAID. In fact, most PC motherboards have a RAID controller, even if not used. RAID stands for Redundant Array of Disks cheap “and was designed to use smaller disks in an array for better performance, scalability and reliability of data and retrieval. RAID achieves these objectives through various configurations. The most common nowadays are RAID 0, RAID 1, RAID 0 +1 / RAID 10 and RAID 5. Each of these RAID types has their own method of redundancy. RAID 0 is striping data across multiple discs. And ‘how to divide data into small fixed size, called “gang”, and writes the scratches on the discs. If the file is written to 5 KB, with a bandwidth of 1 KB and there are 4 disks in a RAID set, the first tape written to disk first, second disk second, and so until the fourth track The fifth band is written in the first disc. This is a quick way to write large files, but if a drive fails, all fails. RAID 1 is called mirroring. This is because the same data is written to two disks simultaneously. In other words, a mirror of a disk. Readings are carried out on two wheels. If one disk fails, there is yet another disc that protects the data and read-write operations continue. This is an effective solution for the price of having two discs to do the job of one. RAID 0 +1 is a combination of RAID 0 and RAID 1. The data are distributed on disks, then speculate about the same number of disks. If you have four disks, the data are spread over the first two, then the couple is reflected in the other two discs. It ‘a robust, but very expensive. RAID 5 is like RAID 0, but with a parity write. Parity is an error correction that is a combination of data on other bands. Furthermore, parity is written to different disks, and not on a single disc. Because of this overload, RAID 5 is slower than RAID 1 or RAID 0 +1. If one disk fails, data can be recovered by calculating the parity of the contents of the failed disk from the contents of other disks. More hot swap the failed drive is removed and replaced, and the data is reconstructed on the fly. There would be a significant performance degradation, while the data is retrieved automatically. RAID was designed to be both robust and scalable. But with each additional hard drive increases the likelihood of a drive failure. RAID is also designed to continue operating even if a single disk failure. And as RAID 0 +1 configuration, although no more hard data is yet to be written and read correctly to a certain extent, but with significant performance degradation. However, in most cases, one must still make a recovery of RAID at some point of failure of multiple disk. RAID data recovery specialist is important for different types of RAID and the implementation of the strategy. RAID data recovery in some cases, require a clean room laboratory for the study of a disk failure before retrieving data. Most data centers use the additional redundant data storage and retrieve data after the array was repaired. In other cases, data are retrieved from backup tape after repair of the RAID set. In the worst cases, very important data, RAID data recovery is done by companies specializing in the treatment of RAID daily.