31400905optical disksPT2026-03-30 20:44:02UF31400906disks, opticalNDUF31400907laser discsNDUF31400908laser disksNDUF31400909laserdiscsNDUF31400910optical discsNDUF31400911optical diskNDBT31359809machine-readable artifactsPTBT31385648data processing mediaPTNT31430262compact discsPTNT31430269DVDsPTNT31430278Blu-ray discsPT