Some of the biggest names in hard disk drives will band together this week to remind the world that storage isn't all about flash. Seagate Technology, Toshiba, Western Digital and HGST will launch the Storage Products Association in the midst of the Flash Memory Summit, a four-day event revolving around storage media that doesn't revolve. Though all the charter members of the SPA make SSDs (solid-state disks) as well as spinning disks, they want to bring HDDs back into the conversation.