+
+ [
+ "data storage", # memory
+ ['B', 1, "byte"],
+ ['kB', 1024, "kilobyte"],
+ ['MB', 1024**2, "megabyte"],
+ ['GB', 1024**3, "gigabyte"],
+ ['TB', 1024**4, "terabyte"],
+ ['bit', 1/8, "bit/octet"],
+ ['Mbit', 1024**2/8, "megabit"],
+ ['LOC', 19e12, 'Library of Congress'], # est. 17-20TB
+ ['CD', 359_847*2048, 'max CD-ROM (700MB) data'],
+ ['DVD', 2_295_104*2048, 'max DVD-ROM data'],
+ ],