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Backblaze do say the price per TB for 3TB drives is better, but obviously you can squeeze more TB per 4U case when you use 4TB drives.

That cuts down on the power usage, cooling, and rack space that you need to pay for.

Disclaimer: I work at Backblaze. We make the decision to switch to the more dense drives when the "break even" point is about 1 year of operation. We have a little spread sheet (it isn't rocket science) of how much electricity a drive uses, what we are paying for the physical space rental, etc. We plug in the prices if the 4 TB drives pay for the overhead within 1 year we go ahead and buy those.

The drives seem to last about 5 years in our experience, so technically we should be able to buy the more dense drive it it pays back in 4 years, but cash to run the business is very dear to our hearts so we don't like going out much more than a year on a payback.

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