Storing digital information, ensuring the accuracy, steady and uninterruptedaccess to the data are considered as fundamental challenges in enterprise-classorganizations and companies. In recent years, new types of storage systems suchas solid state disks (SSD) have been introduced. Unlike hard disks that havemechanical structure, SSDs are based on flash memory and thus have electronicstructure. Generally a SSD consists of a number of flash memory chips, somebuffers of the volatile memory type, and an embedded microprocessor, which havebeen interconnected by a port. This microprocessor run a small file systemwhich called flash translation layer (FTL). This software controls andschedules buffers, data transfers and all flash memory tasks. SSDs have someadvantages over hard disks such as high speed, low energy consumption, lowerheat and noise, resistance against damage, and smaller size. Besides, somedisadvantages such as limited endurance and high price are still challenging.In this study, the effort is to combine two common technologies - SLC and MLCchips - used in the manufacture of SSDs in a single SSD to decrease the sideeffects of current SSDs. The idea of using multi-layer SSD is regarded as anefficient solution in this field.
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