UNE-EN 61834-2
RECORDING. HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING SYSTEM USING 6,35 MM MAGNETIC TAPE FOR CONSUMER USE (525-60, 625-50, 1125-60 AND 1250-50 SYSTEMS). PART 2: SD FORMAT FOR 525-60 AND 625-50 SYSTEMS. (Endorsed by AENOR in February of 1999.)