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Read/write protect scheme for a disk cartridge and drive

  • US 5,644,444 A
  • Filed: 03/10/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 03/10/1995
  • Status: Expired due to Term
First Claim
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1. A method of inhibiting inadvertent and unauthorized writing and reading of information to and from a storage medium comprising the steps of:

  • writing a first code in a predetermined location on the storage medium, said first code being indicative of a first protection mode of said storage medium;

    receiving a command to change the protection mode of said storage medium from said first protection mode to a second protection mode and, in response to the command, writing in said predetermined location on the storage medium, in place of the first code, a second code indicative of the second protection mode; and

    receiving a second command to change the protection mode of said storage medium from said second protection mode back to said first protection mode, and, in response to the second command, rewriting in said predetermined location on the storage medium, in place of said second code, said first code indicative of said first protection mode.

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