双: two; twin; both; dual密度: density; thickness磁带: tape双密度磁碟: double-density disk双密度磁盘: diskette2d双密度磁片: diskette2d高密度磁带: high density digital tape; high density tape; high-density tape混合密度磁带: mixed density tape高密度磁带记录器: high-density tape recorder双密度: dd dual density; density, double (dd); double density，dd; dual density主幅度磁带: master output tape双密度编码: double density encoding双密度格式: double density format双密度记录: double dense recording; double density recording; double-density recording双密度录写: double-dense recording双密度软碟: double density floppy disk单密度磁盘: single density disk; single-density disk高密度磁盘: compact disk; high density disk密度磁轨: density tracks标准厚度磁带: standard thickness tape双密度软磁盘: double density floppy disk双倍密度磁盘: double de ity disk; double density disk四倍密度磁盘: quad de ity disk; quad density disk双密度软磁盘机: double density floppy disk drive双密度软碟控制器: dual-density floppy disk controller
