Until the cost of flash storage comes down to the same plane of existence as most human wallets, hybrid solutions -- which pair an HDD with an SSD cache -- remain a smart way forward. OCZ scored some attention with its Synapse products, so now Crucial has to wave its arms in our faces and point to its own offering: the Adrenalin Solid State Cache Solution, which pairs a 50GB m4 SSD with proprietary caching software, and which will be out sometime this quarter for an undisclosed but surely rivalrous price. In the meantime, a fresh range of pure-breed m4 drives is already available, looking much like their predecessors but now whittled down to a mere 7mm in thickness so they can be squeezed into ever-narrower crevices. Pricing starts at $119 for 64GB and tops out at $795 for 512GB -- like we said, not your average plane of existence.