Data access method for solid state disk

Abstract

The invention discloses a data access method for a solid state disk. The solid state disk comprises a cache and a nonvolatile memory, wherein the cache consists of DRAM or SRAM, and the nonvolatile memory consists of a flash memory and a phase-change memory or a magnetic memory. The data access method comprises the following steps: when writing data, firstly saving the data into the cache, and then saving the data into the nonvolatile memory; when reading the data, firstly reading the data from the cache, and then reading the data from the nonvolatile memory. The method divides the cache intoa plurality of data blocks, and records the write-in times, reading times and marks of the data blocks in the cache; and the method divides the nonvolatile memory into a plurality of data blocks, andrecords the write-in times, reading times and marks of the data blocks in the nonvolatile memory. By balancing the read-write load of each data block, the data access method for the solid state disk effectively prolongs the service life of the solid state disk, improves the data read-write efficiency, and ensures the security of storing the data.

Description

technical field [0001] The invention relates to an information storage device and a control method for information storage thereof. Background technique [0002] With the development of computer technology, the data transmission efficiency and energy consumption of hard drives have become increasingly prominent performance bottlenecks in computer systems. At present, the data throughput between the CPU (Central Processing Unit) and the memory has exceeded 10GB / s, while the continuous data transfer rate of the hard disk is only about 50MB / s, a difference of about 200 times, which makes the hard disk the largest system performance in many cases. bottleneck. [0003] A traditional hard disk mainly includes disk and SRAM cache. Since the disk adopts a mechanical reading and writing method, there is the above-mentioned performance bottleneck problem. In order to improve the performance of the hard disk, a new solid state disk (SSD, Solid State Disk) has been developed in the i...

AI Technical Summary

Problems solved by technology

However, flash memory has a limited number of reads and writes, and the read and write operations of hard disks are concentrated in a specific storage area within a period of time, which makes the use of solid state drives difficult.

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