High competitions from Dell, EMC, APPL....Amazon uses its own storage devices. I'n not sure if NetApp can survive in long term. Watch and see.
Probably not worth the effort... but Dell resells/rebadges NetApp storage. APPL does not sell networked storage, and actually buys their internal storage from NetApp, and Amazon is a NTAP sales partner. But hey, 1 out of 4 ain't bad.