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Card type storage medium and card type storage medium issuing apparatus

  • US 5,506,397 A
  • Filed: 10/28/1994
  • Issued: 04/09/1996
  • Est. Priority Date: 02/25/1994
  • Status: Expired due to Term
First Claim
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1. A card type storage medium comprising a storage unit having a file area holding data in each file as a unit and a directory area holding therein control information units each including a PIN of a data file in said file area and a control unit managing data files in said file area in said storage unit on the basis of said control information units in said directory area in said storage unit, said control unit allowing an access process on a data file by said control unit only when a PIN held in said control information unit in said directory area in said storage unit is in agreement with a PIN inputted from outside, the improvement comprising:

  • a dedicated file being set in said file area in said storage unit, said dedicated file holding PINs of the data files held in said control information units in said directory area in said storage unit and file names of the data file such that the PIN and the file name of each data file correspond to each other;

    another control information unit being set in said directory area in said storage unit, said another control information unit holding a master PIN of said dedicated file.

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