Topic summary
Hard disk drives
Extracted from the Wikipedia article Hard disk drive.
The revenues for SSDs, most of which use NAND flash memory, slightly exceeded those for HDDs in 2018. Flash storage products had more than twice the revenue of hard disk drives as of 2017. Though SSDs have four to nine times higher cost per bit, they are replacing HDDs in applications where speed, power consumption, small size, high capacity and durability are important. As of 2017, the cost per bit of SSDs was falling, and the price premium over HDDs had narrowed.