[计]?单驱动器

... 单区域文件 single extent file 单驱动器 single driver 单驱动软（磁）盘系统 single drive floppy disc system ...

?单磁盘机

... 磁盘机阵列 array of drives; array, drive 单磁盘机 single driver 单片磁盘机 single platter drive ...