Portable 4D code synchronous recording machine SDK-8 is a suitable for the public security system for on-site forensics of the disc burner. The machine is compact, easy to operate, stable performance and reasonable price. The industry's original optical raw data quad cipher (4D code) encryption technology and "zero cache" data direct engraving technology to ensure the originality, uniqueness and integrity of optical disk data. Products fully comply with the GA/T882-2010 "Digital Interrogation (Interrogation) Recording System Technical Requirements" industry standards.