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I have wondered about system downtime or time operating in a degraded state.

My understanding is other than mirrored, RAID configurations may take a long time to rebuild on the larger drives and this is a contributing factor to why the highest sales volume of drives has been 'stuck' at 4TB (thus the lower $/GB price).

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They don't use traditional RAID setups there. My understanding is they use a proprietary data encoding and distribution, which is more accepting of individual drive failures and reduces rebuild times. I believe I've heard they use something more like erasure coding rather than RAID-5.

https://www.backblaze.com/blog/reed-solomon/

There are many open source libraries.

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