| 摘要 |
A data storage device having the capability of preventing unauthorized access to data stored therein, including a memory, e.g., a flash EEPROM, having a first portion for storing a plurality of internal passwords and a second portion for storing address data, e.g., encoded password addresses and status identification data, indicating the location of the internal passwords in the first portion, a control circuit responsive to an access request signal from an external device, e.g., a host computer, for reading the internal passwords from the first portion of the memory in accordance with the address data stored in the second portion of said memory, a comparison circuit coupled to the control circuit for comparing the internal passwords read from the first portion of the memory with external passwords received from the external device and for generating a comparison output signal indicative of whether respective ones of the internal and external passwords match and, an access permission signal generating circuit responsive to the comparison output signal for generating an access permission signal having first and second logic levels indicative of whether the external device is permitted or denied access to the data stored in the data storage device, respectively.
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