What is a stable repository?

Information stored on the hard disk of the computer is recorded as a number of magnetic pulses; It cannot be read, used or manipulated without a hardware that stores it. Physical damage to the drive and other types of system corruption, including viruses, can easily undermine the integrity of information stored on the unit by mixing or damage to the drive system system. Ensuring a stable storage on the computer means the design of the system of information storage system that is guaranteed against immediate errors after the registration operation, which adds or replaces stored data. Basic commercial hard drives do not qualify as stable storage on their own; However, for software and configuration tools, they can meet stable storage requirements.

In order to consider stable storage, after the entry procedure - in which the information is stored on the disk - the unit must be able to read the accurate information immediately written without errors. This explains why commercial hard drives fail as stableStorage: There is always a possibility that the unit returns an error message after any specific registration operation. However, some techniques convert commercial hard drives into stable storage devices.

Increasing the stability of commercial hard drives is possible through software management techniques. One software management technique is forcing the unit to write to two separate disk locations for each registration operation, which provides redundant. While one of these places could return an error, the other is statistically unlikely to do the same, resulting in a higher level of stable storage.

Another technique is to create an excess field of cheap discs or a short raid. The RAID1 bundle is an unnecessary volume technique known as "mirroring". It uses two hard drives working in tandem. When the enrollment of the pecunition, the same information is written on both units simultaneously. Provides thatReal time backup solutions for all data on the unit, making it a safer form of stable storage.

There are disadvantages of these techniques. The first is the economy; In both cases, the effective size of the hard disk is half, because the information is constantly duplicated for backup purposes. The second is the price; For basically half the disks, storage costs can become considerable depending on the amount of data stored.