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hitachi推出DVD－RAM驱动器日本ffitachi有限公司依据DrpchAM技术规范于1997年中期推出了首台DWWRAM驱动器样机。该新型驱动器采用滚动台W记录和相变记录技术，容量达2．6GB／面。其GFI000系列采用了带双透镜和双激光头的光学传感器以及包括DSP在内的芯片集系列。两个激光H极管
Hitachi Launches DVD-RAM Drive Japan’s ffitachi Co., Ltd. launched its first DWWRAM drive prototype in mid-1997 in accordance with the DrpchAM specification. The new drive uses rolling table W recording and phase change recording technology, capacity of 2.6GB / surface. The GFI000 Series incorporates optical sensors with dual lenses and dual laser heads and a family of chipsets including DSPs. Two laser H-tube