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In page Hard disk drive:

"

A laboratory demonstration of a 1.33 Tb 3D NAND chip with 96 layers (NAND commonly used in solid-state drives (SSDs)) had 5.5 Tbit/in2 as of 2019),[12] while the maximum areal density for HDDs is 1.5 Tbit/in2. The areal density of flash memory is doubling every two years, similar to Moore's law (40% per year) and faster than the 10–20% per year for HDDs. In 2025, the maximum capacity was 36 terabytes for a HDD,[13] and 100 terabytes for an SSD.[14] HDDs were used in 70% of the desktop and notebook computers produced in 2016, and SSDs were used in 30%.[15] In 2025 HDDs are not found in laptops, if not very rarely, and most desktops come with an SSD only, though some still are configured with an SSD and HDD, or rarely with an HDD only.[citation needed]