Here's a whitepaper from Seagate with some details: http://www.seagate.com/files/www-content/product-content/enterprise-hdd-fam/enterprise-capacity-3-5-hdd-10tb

Here's a whitepaper from Seagate with some details: http://www.seagate.com/files/www-content/product-content/enterprise-hdd-fam/enterprise-capacity-3-5-hdd-10tb/_shared/docs/helium-drive-launch-tp686-1-1602us.pdf http://www.seagate.com/files/www-content/product-content/ent... Sounds like they design them for a 5 year life.