MD（MiniDisc，迷你光盘）

MD（MiniDisc，迷你光盘） 和 DV（Digital Video，数码视频磁带） 是两种不同领域的存储媒介，分别对应音频和视频市场，主要活跃于 20世纪90年代至2000年代初期。

1. 索尼MD（MiniDisc）
   推出时间：1992年
   索尼在1992年发布MiniDisc，旨在替代传统的卡式磁带（Cassette Tape）和CD，提供可擦写、便携的数字音频存储方案。

技术特点：

使用磁光技术（Magneto-Optical），支持录音和擦写。

单张MD容量为 74分钟/140MB（后期扩展至80分钟）。

主打便携性，搭配MD Walkman播放器。

流行时期：

1990年代中后期：在日本和部分亚洲市场较受欢迎。

2000年代初期：逐渐被MP3播放器和闪存存储（如iPod）取代。

2013年：索尼宣布停产MD Walkman，标志MD时代终结。

2. 索尼DV磁带（Digital Video Cassette）
   推出时间：1995年
   索尼联合松下、JVC等厂商推出 MiniDV 格式，作为家用数码摄像机的标准存储介质。

技术特点：

磁带尺寸小巧（约6.35mm宽），支持数字视频录制。

单盒MiniDV磁带可录制 60分钟 的标清（720×576）视频。

画质优于传统模拟制式（如VHS-C、Hi8）。

流行时期：

1990年代末至2000年代中期：成为家用和半专业摄像机的主流存储格式。

2000年代末：随着闪存卡（如SD卡）、硬盘和固态存储的普及，DV磁带逐渐退出市场。

2016年：索尼宣布停产MiniDV磁带。

3. 两者的技术影响与替代品
   MD的替代：
   MP3播放器（如iPod）、CD-R/W、以及流媒体服务终结了MD的使命。

DV磁带的替代：
存储卡（AVCHD格式）、硬盘摄像机、智能手机录像功能取代了磁带介质.

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