This is a brand new Kingston 256GB Solid State Drive for the Macbook and Macbook Pro models. Please note that some Macbook models have reported compatibility issues between 256GB SATA II drives and the SATA controller inside the machine. Apple has released a firmware update to fix some issues, but not all problems have been resolved.
Why Solid State:
Solid state drives have several advantages over the magnetic hard drives. The majority of this comes from the fact that the drive does not have any moving parts. While a traditional drive has drive motors to spin up the magnetic platters and the drive heads, all the storage on a solid state drive is handled by flash memory chips. This provides three distinct advantages: * Less Power Usage * Faster Data Access * Higher Reliability