In this paper, the method of downsizing 4K uncompressed video signal generator is introduced. It is required large data transmission bandwidth to output uncompressed 4K video signal. A SSD is known as a storage device with large data transmission bandwidth. The conventional technology for producing 4K uncompressed video output was redundant arrays of inexpensive disks technology using multiple SSDs. There was a problem that the size of 4K uncompressed video signal generator apparatus became too large by many SSDs. We have figured out the solution to such problem, by means of the NAND flash control method without SSDs.