On Tue, 24 Jan 2012, Jim Klimov wrote:

Or does the 10^14 rating just reflect the strength
of the on-disk ECC algorithm?

I am not sure how much the algorithms differ between
"enterprise" and "consumer" disks, while the UBER is
said to differ about 100 times. It might have also
to do with quality of materials (better steel in ball
bearings, etc.) as well as better firmware/processors
which optimize mechanical workloads and reduce the
mechanical wear. Maybe so, at least...

In addition to the above, an important factor is that enterprise disks with 10^16 ratings also offer considerably less storage density. Instead of 3TB storage per drive, you get 400GB storage per drive.

So-called "nearline" enterprise storage drives fit in somewhere in the middle, with higher storage densities, but also higher error rates.

Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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