| 摘要 |
A disk driving mechanism is provided with a program memory section storing programs corresponding to a plurality of operational modes of the device and a mode set switch for applying an operational mode to an input/output section of the device. A central processing unit is provided for recognizing the operational mode set by said mode set switch, and for operating the device according to a program read out of the program memory corresponding to the selected operational mode. According to the invention, a floppy or hard disk drive may be operated by itself, without the aid of a host computer, for the purpose of self-diagnosis.
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