As used in the Event Horizon Telescope from what I've been reading. Multi-generational, upgradeable, modular, resilient, robust, fixable, shippable storage (any adjectives I've missed?) - with thoroughly understood performance for high data rate transfers - operating in at high altitude away from normal spare parts supply chains. Device production lifecycle to match scientific programme schedule. Somewhere in the region of 6PB's worth crated and returned post-acquisition to the EHT consortium processing sites.