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 ), 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. , the maximum capacity was 16 terabytes for an HDD, and 100 terabytes for an SSD. HDDs were used in 70% of the desktop and notebook computers produced in 2016, and SSDs were used in 30%. The usage share of HDDs is declining and could drop below 50% in 2018–2019 according to one forecast, because SSDs are replacing smaller-capacity (less than one terabyte) HDDs in desktop and notebook computers and MP3 players.
a laboratory demonstration of a 133 tb 3d nand chip with 96 layers (nand commonly used in solid-state drives (ssds)) had 55 tbit/in2 ) while the maximum areal density for hdds is 15 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  the maximum capacity was 16 terabytes for an hdd and 100 terabytes for an ssd hdds were used in 70% of the desktop and notebook computers produced in 2016 and ssds were used in 30% the usage share of hdds is declining and could drop below 50% in 2018–2019 according to one forecast because ssds are replacing smaller-capacity (less than one terabyte) hdds in desktop and notebook computers and mp3 players