Data safety belongs to one of the highest priority of every company. We consider only data loss raised by technical equipment failure. Data loss are the most often caused by hard disc failure. it is natural, since it is equipment which is liable to physical depreciation and which is sensible to inadequate manipulation and physical impacts. It is possible to fight such types of data loss by creating RAID disc arrays. The most often used types of RAID disc arrays are RAID0, RAID1 and RAID5, or their combinations.

The RAID0 disc array does not add any safety to your data. It enables only faster access to the data. It utilizes concurrent accesses to more medias in a time. It is possible to add arbitrary many discs to this type of disc array. The aggregate capacity of the array is equal to the sum of capacities of all the discs.

The RAID1 disc array offers more security by creating identical copy of data to another media. It is possible to add arbitrary many discs to this type of disc array. Every disc than contains identical copy of data. This type of array is resistant against failure of all the discs except one of them. The aggregate capacity of the array is equal to capacity of the capacity of one disc.

The RAID5 disc array offers more security by distribution data over discs and by creation of parity sum. This type of array requires at least 3 discs to create. This type of array is able to recover after failure of one of the discs in the array. It's capacity is not so dramatically degraded as in previous type of array.

It is possible to implement all the types of the RAID disc arrays in harware and in software approach. Hardware implementation is more costly but at least in RAID5 implementation is much faster. When using RAID0 and RAID1 arrays, the speed between software and hardware implementation is comparable. We could advice the usage of RAID1 mirroring in the Linux operating system as a low cost and reliable solution for your data safety.