Patent ID: 7249282

Claim:
A data storage device comprising: a volatile memory storing data for a video display; a buffer memory coupled to an output of said volatile memory; a non volatile memory coupled to an output of said buffer memory; a first power supply coupled to said volatile memory; a second power supply coupled to said non volatile memory; a power sensing device coupled to said first power supply; a controller coupled to said power sensing device, said volatile memory, said buffer memory, said non volatile memory, and said first and second power supplies; said controller configured to first transfer said data from said volatile memory to said buffer memory when said power sensing devices senses a low power condition and subsequently to transfer data from said buffer memory to said non volatile memory; said first power supply energizing said volatile memory during said first data transfer and at least a portion of said subsequent data transfer; said first power supply de-energizing said volatile memory before said subsequent data transfer is competed.