 Some of the first laserdisc releases on the market from Discovision were mastered by the company using IVC 9000 VTRs for master videotape playback for making glass masters during the laserdisc replication process.Discovision later switched to using 1" Type C videotape around the early 1980s for laserdisc mastering when IVC ceased 9000 support in the US.The IVC9000 was (like its smaller sister 800 products) well utilised in Great Britain.