![]() Such systems can be used to store music or movies, for example. For this reason, even some computers and appliances that are used at home have some RAID functions. Since its discovery, the cost of building a RAID system has come down a lot. There are different ways in which RAID systems can be made. Ĭompanies have used RAID systems to store their data since the technology was made. Most of the work on RAID is based on a paper written in 1988. Certain kinds of errors will make it impossible to read the data.Depending on the configuration and the size of the disks, this reconstruction can take a long time. After the failed disks have been replaced, the data needs to be reconstructed. In some configurations, RAID can tolerate that one or a number of disks fail.They do not protect against the data being deleted or overwritten, though. Certain choices can protect against data being lost because one (or a number) of disks failed.It is not possible to achieve all of these goals at the same time, so choices need to be made. To get more flexibility (Disks can be changed or added while the system keeps running).To get more storage space by having many smaller disks.This is done by having several copies of the data. To make the loss of data happen less often.Each of the methods that puts the hard disks together has some benefits and drawbacks over using the drives as single disks, independent of each other. There are different ways this can be done. With RAID, several hard disks are made into one logical disk. RAID is an acronym that stands for Redundant Array of Inexpensive Disks or Redundant Array of Independent Disks.
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