He is critical of the UBS ETN, meanwhile, for basing itself on an index of 11 constituents, most of which are companies that make, among other things, a type of hard-disk drive currently in vogue.

WSJ: Fat Years for Narrowly Focused ETFs

Then do-it-yourself type houses -- just bring your disk!

FORBES: What's new, what isn't

By comparison, meteors of the type that hit Russia originate at the earliest reaches of time in the disk of gas and dust that swirled around the early sun.

WSJ: Russia Meteor Was Largest in More Than a Century

The NAND type could contain more than double the amount of information and be slower if used like a floppy disk or hard drive.

FORBES: Magazine Article