SSD Features and Technology
In terms of nature, the SSD can be classified into two: flash based and DRAM (Memory Dynamic Random Access) based.
In today’s market many of us meet flash-based SSD technologies, such as Flash Disk, Secure Digital (SD) Card, Micro SD Card, Multi Media Card (MMC) and Compact Flash (CF). Although SSD with conventional hard disk physical size, which measures 1.8 inches and 2.5 inches with a capacity of up to 128 GB, since 2008 became popular in the market along with cheaper prices.
Flash-based SSD uses a small amount of DRAM for cache used to store information about placement of data blocks and use leveling information (techniques for extending flash-based memory life). While on high achievement SSDs are usually equipped with temporary power storage (energy storage).
This component typically consists of a series of capacitors or batteries that work to transfer data from SSD cache to flash memory when the computer is unmounted / unexpectedly off (if based on the capacitor) or caching data temporarily (if using a battery).