as long as were talking about unorthodox ways to store info, does anyone know about the information density possible in laser engraved glass? You know, those bl

as long as were talking about unorthodox ways to store info, does anyone know about the information density possible in laser engraved glass? You know, those blocks of glass with a design etched into the interior? If we can produce an etching in the middle of a block of glass,why can't we encode symbols as collections of 'pits' in the glass. If we can etch transistors in silicon at 14 nm (ok, lets be generous and say 25 nm), then we can produce a 25 nm pit in a transparent hunk of silicon dioxide.Add 25 nm for the blank space next to it needed for its definition and a bit is 50 nm. In a 1 mm cube you code fit 8000 bits or 1000 characters. 16 megabits per cubic inch. Compared to 1.2 nm per character in DNA it seems low but remember that DNA is linear. In a square inch (2.54 cm x 2,54 cm) DNA can store 5.38 terabits. Hard disks are at 1 terabit per square inch. I probably do not have the technical knowledge to actually know what the smallest laser engraved dot in glass could be. And then again you only end up with a ROM