System for controlling host access to a storage device based on physical characteristics of the storage device

An information recording/reproducing system comprising:

• a magnetic disk apparatus for recording/reproducing information and a host system to which said magnetic disk apparatus can be removably connected, said host system being capable of accessing said magnetic disk apparatus for recording/reproduction of the information,
• wherein said magnetic disk apparatus includes:
• a magnetic disk, and
• authentication key generating means for generating an authentication key on the basis of physical characteristic of said magnetic disk apparatus itself, and
• wherein said authentication key is generated on the basis of result of wavelet transformation of an eccentricity compensating signal for compensating for eccentricity characteristic of a magnetic disk which said magnetic disk apparatus includes.

An information recording/reproducing system comprising:

• a magnetic disk apparatus for recording/reproducing information and a host system to which said magnetic disk apparatus can be removably connected, said host system being capable of accessing said magnetic disk apparatus for recording/reproduction of the information,
• wherein said magnetic disk apparatus includes:
• a magnetic disk, and
• authentication key generating means for generating an authentication key on the basis of physical characteristic of said magnetic disk apparatus itself, and
• wherein said authentication key is generated on the basis of eccentricity compensating signals generated for different cylinders at three locations at the most.

An information recording/reproducing system comprising:

• a magnetic disk apparatus for recording/reproducing information and a host system to which said magnetic disk apparatus can be removably connected, said host system being capable of accessing said magnetic disk apparatus for recording/reproduction of the information,
• wherein said magnetic disk apparatus comprises:
• a magnetic disk,
• authentication key generating means for generating an authentication key on the basis of physical characteristic of said magnetic disk apparatus itself,
• means for generating an eccentricity compensating signal for compensating for eccentricity of a magnetic disk which said magnetic disk apparatus includes,
• means for enciphering said eccentricity compensating signal on the basis of said authentication key,
• means for recording said eccentricity compensating signal enciphered, and
• means for deciphering said enciphered eccentricity compensating signal to thereby restore the eccentricity compensating signal before having been enciphered on the basis of said authentication key.