An SSD is a non-volatile storage medium, which stores persistent data on a storage flash. A Flash controller and NAND flash memory cards are two key componentes for SSD. The SSD Controller architectural setup is optimized to provide sequential and random data requests with high reading and write performance. Sometimes SSDs are referred to as solid-state disks or flash drives. ¹⁾

Contrary to an HDD, an SSD has no moving components that can break or spin up or down. A conventional HDD consists of a spins disc on a mechanical arm known as an actuator with a read/write head. As an integrated device, the HDD mechanism and harddisk are packed. A spinning HDD will magnetically read and write data, which is one of the oldest continuously used storage media. However, the magnetic characteristics can result in mechanical failure. An SSD reads and writes the data on a substratum of interconnected flash memory chips made from silicone. ²⁾