"So it was a software glitch. Makes sense. But how did
the company recover all of this data if the glitch traveled so
widely so quickly?
"Answer: Google still stores e-mail data on tape.
"Yes, tape. Like, essentially the technology behind the
cassette. Google doesn't specify what kind of tape it's using
exactly, but as Seth Weintraub notes on a blog on the CNN partner
site Fortune.com, using tape is a mess."