On RAID class data recovery from RAID0,RAID1 and RAID5 characteristics

What are the characteristics of RAID class disk arrays? RAID0, how secure are the disk arrays such as RAID1 and RAID5? This paper discusses the data security and recovery difficulty of these common raid arrays through RAID0,RAID1 and RAID5 characteristics and security comparisons.
First of all, we need to know the disk array raid,raid the ordinary hard disk into a disk array, the host writes the data, due to the use of parallel read and write operations, thereby increasing the access speed of the storage system access system. It has nine modes, named for RAID 0, RAID1 to raid 7, and raid 0+1, and the most common are the 1 modes of RAID 0, RAID 5, RAID four, and raid 0+1. Today we are dealing with three types of RAID 0, RAID 1, RAID 5. In terms of data security and speed, it must be RAID5 better. RAID1 is the fastest in terms of data reading. In terms of data security, RAID1 is best. RAID0 is the fastest in terms of data writing. In comparison, RAID5 combines these advantages.
RAID0 is not a real raid structure, there is no data redundancy, RAID0 continuously split the data and read and write to multiple disks in parallel, so it has a high data transfer rate. However, while RAID0 can provide more space and better performance, the entire system is very unreliable, and if there is a failure, the risk of data loss is very high. RAID0 after a failure, to recover the data, you must first repair the failed member disk, or to make a full disk image, that is, in the recovery of RAID0 data, all member disks can not be missing.
The RAID1 is the most expensive in the disk array, but provides the highest data availability rate. When a disk fails, the system can be automatically swapped to the mirrored disk without the need to reorganize the failed data. RAID1 data redundancy through data mirroring, resulting in mutually backed-up data on two separate disks. RAID1 can improve read performance and can read data directly from the mirror when the raw data is busy. So RAID1 data recovery is the simplest of all raid, if the RAID controller or RAID information error causes the RAID1 data inaccessible, as long as the two physical disk block from the server, as a separate hard drive on a computer, it is easy to restore data.
The RAID5 does not have an individually specified parity disk, but instead accesses data and parity information on all disks in a interleaved manner. On the RAID5, read-write pointers can be manipulated simultaneously against a list of devices, providing higher data traffic. RAID5 is more suitable for small data blocks, random read and write data. For general RAID5 Data Recovery, we need to understand the following parameters: order, block size, rotation and data start sector. Therefore, the data recovery for RAID5 is the process of determining these four parameters through the file system, file format, and other relevant data in the disk. When these four parameters are determined, it is possible to restore the data within the RAID5 by means of the relevant tools, such as the day Shield RAID disk array data recovery software, which restores the data scattered on each disk to the actual data in RAID5.
For RAID0, RAID1 and RAID5 these disk array HDD physical damage caused by the logical loss, restore the required technical difficulties, the opening recovery is required to clean the environment, do not recommend their own or use software recovery, to avoid permanent damage to data, in order to data security, may wish to first consultDay Shield Data Recovery CenterSenior data Recovery Specialist.

On RAID class data recovery from RAID0,RAID1 and RAID5 characteristics