Solid state disks are storage devices that have no moving parts.
The biggest advantage of Solid State storage devices over conventional disk drives is the speed at which data can be accessed from random locations. This is because with a conventional disk storage device the time taken to access the data is almost entirely made up of the time taken for the head actuator mechanism to position the read/write heads over the desired track (seek time) PLUS the time taken before the data on the rotating disk platter is positioned under the read write head (rotational delay). Both of these significant delays, which account for virtually ALL of the I/O access time, are eliminated with Solid State devices.
Another advantage of having no moving parts is that unlike conventional disk storage devices Solid State devices are extremely resilient to shock and vibration.

There are two main types of Solid State storage devices, DRAM/SRAM based devices and smaller, lower power consumer product devices based on Nand Flash memory technology.
The Gnutek Maracite range of solid state storage devices incorporate the latest Nand Flash memory techniques rather than the older DRAM or SRAM technology used in more conventional Solid State storage devices. The main advantages Nand Flash technology has over DRAM/SRAM based technology are: