"There are two reasons for this: bandwidth limitations and the data integrity issues posed by the commodity drives that are typically used in cloud services."

"There are two reasons for this: bandwidth limitations and the data integrity issues posed by the commodity drives that are typically used in cloud services." Why does using commodity drives entail data integrity issues? Doesn't everyone use commodity drives? I know Google does [http://www.google.ca/#hl=en&source=hp&q=Google+commodity+drives http://www.google.ca/#hl=en&source=hp&q=Google+commo...]..