| 摘要 |
The present invention relates to data storage apparatus comprising a removable data storage medium, first control means for initially "powering on" the apparatus and for enabling the apparatus to receive a data storage medium, mode setting means for setting the apparatus into an "operate" mode state or a "non-operate" mode state, means for receiving commands to perform operations in connection with the data storage medium, and second control means for controlling the operation of the apparatus on receipt of the commands. According to the invention the apparatus is characterised in that the mode setting means sets the apparatus into a "non-operate" mode state on operation of the first control means to "power on" the apparatus or to enable the apparatus to receive a storage medium, and the second control means, on receipt of a command, checks the mode state (132) and performs operations as follows: (a) if the mode state is "non-operate", (i) checks to see if the received command is a "Mode Set" command (140), (ii) if the received command is not a "Mode Set" command, rejects said command (141), and (iii) if the received command is a "Mode Set" command, sets the mode state to "operate", and (b) if the mode state is "operate" causes performance of the received command (142). <IMAGE>
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