The S25 SAS.
Press release
Up to 900GB capacity, max 204MB/s transfer rate, 2.5" form factor, 32MB cache, SAS 6Gbps interface, 7.8W max/5.3W at idle, 5 years warranty, rather noisy with 37dBA seeks. No idea about the price. Much slower than an SSD, but also certainly cheaper for similar...