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http://www.seagate.com/www/en-us/products/internal-storage/momentus-xt-kit/
This is example from Seagate, but I am sure every brand will produce their own. It mixed Solid State (Flash) with Winchester HDD. There is 4GB of SSD in this 500GB Winchester example. That flash is another layer of cache from which the drive will transfer data to the slower HDD at time that users are not awaiting. Unlike the RAM (upto 64MB these days) cache the Flash are not lost when power is suddenly lost. HDD these days use their spindle mass to store some power to flush their RAM Cache when power is lost, but this is very limited. 4GB of Flash is only few dollars these days, so it is worthwhile.
This is example from Seagate, but I am sure every brand will produce their own. It mixed Solid State (Flash) with Winchester HDD. There is 4GB of SSD in this 500GB Winchester example. That flash is another layer of cache from which the drive will transfer data to the slower HDD at time that users are not awaiting. Unlike the RAM (upto 64MB these days) cache the Flash are not lost when power is suddenly lost. HDD these days use their spindle mass to store some power to flush their RAM Cache when power is lost, but this is very limited. 4GB of Flash is only few dollars these days, so it is worthwhile.