Seagate is planning on releasing a disk that's part spinning rust and
part flash:
http://www.theregister.co.uk/2010/05/21/seagate_momentus_xt/
The design will have the flash be transparent to the operating system,
but I wish they would have some way to access the two components
separately. ZFS could certainly make use of it, and Linux is also
working on a capability:
http://kernelnewbies.org/KernelProjects/DmCache
http://lwn.net/Articles/385442/
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