| 摘要 |
<p>A method of recording information, comprising the steps of: (a) providing a magnetic storage means having magnetisable material and deliberately inhibiting the magnetic properties of said material over a zone of said storage means (b) determining an inhibition value related to and indicative of at least one of the location and area of said zone, said inhibition value being specific to the one particular storage means deliberately inhibited in step (a), and (c) subsequently recording said information in a manner such that replay thereof is only possible if a signal corresponding to the said inhibition value specific to that said particular storage means is first obtained. Determination of said inhibition value is by means of a computer program providing the sub-steps of (i) writing repeatedly a predetermined number of times to said storage means over an area including (at least part of) said zone a character set composed of at least one character (ii) reading back the matter written over said area, and (iii) calculating the difference between the number of times said character set was written and was read back, the value of this difference providing said inhibition value. Recording step (c) includes the provision of an initialising program which comprises a repetition of the same sub-steps (i), (ii) and (iii) but the difference value last found is compared with the inhibition value first obtained and if a predetermined matching requirement is fulfilled by this comparison then said signal is generated. The invention also provides a magnetic storage means or recording medium to which method steps (a) and (b) have been applied, method step (c) being applied to another zone of the same storage means/recording medium or to another storage means/recording medium that is paired with the first.</p> |
