A head crash in a fixed hard disk generally destroys the data, whereas the failure of a tape drive or opticaldisk drive often leaves the data cartridge unharmed.
对于固定的硬盘，磁头撞击通常会破坏数据，然而磁带或光盘驱动器的错误通常对数据盘碟是无害的。
2
Opticaldisk holds much more, data than many magnetic disks.
光盘能够存储比磁盘多得多的数据。
3
From an opticaldisk as a recording medium, a title retrieval section 310 reads title information about each title of motion picture data recorded on the opticaldisk.