I was reading bunnie’s recent post on the manufacturing techniques used in USB flash-drives… bare die manipulated by hand with a stick!
Today I found an old (128MB!) SD card from my Palm Tungsten-T. Circa 2005 if I remember rightly. Very different technology, actual chips soldered down on the board. And it’s clear that the SD card form factor was very much defined by the physical size of the NAND flash chips available at the time!