HDDs are based on magnetic spinning platters, a technology that has been in use since the mid- 1950s. The data is written to and read from these spinning platters or disks via moving heads. Due to having many moving parts, HDDs are more prone to mechanical failures and failures due to environmental conditions such as heat, cold, shock and vibration. SSDs are built using NAND Flash OR dram memory chips in place of platters and other mechanical mechanisms found in hard disk drives (HDDs), reducing read/write latency and mechanical failure.