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Yes, it's MTBF, which is what the comment I was responding to asked for.

The warranty is 5 years, and from the datasheet the AFR is rated at 0.35%.

http://www.seagate.com/www-content/product-content/enterpris...

Also note that that is "over a five year service life". So, they do not guarantee the helium to be still there after that. Given the nature of this stuff, it likely will slowly escape, but I guess professionals using these will want to retire them fairly soon afterwards.

Does anyone guarantee anything about any hard disk after 5 years? :)

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