Have you ever wondered how they cram so much memory into such a small package as a microSD card? When you read about microchip memory capacity the units you see used in industry reports are most bits not bytes. To get bytes you need to divide that number by 8 -- 8bits/byte. I work in the industry and have often wondered how they get 16GB (gigabytes) of memory into a tiny microSDHC card. Click on the link below to find out how and see some cool pictures. Sandisk Uses Nine-Chip Stack in Latest microSD Card Holy schmenkies Batman! NINE chips stacked on one another! And wiredbonded together to boot. I'm humbled at what they're doing. OMFG! When the author mentions that each chip has been thinned to less than 30µm (microns or millionth of a meter). It would take a stack of over 30 of those chips to make it one millimeter thick! Those chips are made on wafers 300mm in diameter (12 inches or roughly the size of an LP record or LaserDisc) that was orginally 725µm thick. It's then thinned using one of a number of techniques including grinding and plasma processing... Impressive!