In the past, users were forced to choose between HDDs with high storage capacity or DRAMs offering high performance. Advancements in NAND flash allowed for a new, comprehensive option: the flash-based SSD. NAND flash is a nonvolatile (NV) semiconductor memory device. Unlike DRAMs, NAND chips do not need a continuous power supply to retain stored data. Flash-based SSDs provide greater storage capacity and better performance and speed at a cost-effective price point.