Method, apparatus, medium for storing and controlling accessibility to a removable medium

• US 6,286,087 B1
• Filed: 10/30/1998
• Issued: 09/04/2001
• Est. Priority Date: 04/16/1998
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shigeyoshi, Tanaka, Ito, Masahiro
• Primary Examiner(s): NGUYEN, THAN VINH
• Application Number:
  US09/183,607
• Time in Patent Office: 1,040 Days
• Field of Search: 711/4, 711/111, 711/112, 711/115, 711/147, 711/152, 711/163, 711/164, 395/186, 395/188.01, 705/18
• US Class Current: 711/164
• CPC Class Codes: G11B 20/00152 involving a password
• CPC Class Codes: G11B 20/00695 said measures preventing that data are read from the recording medium
• CPC Class Codes: G11B 20/00702 said measures preventing that data are recorded on the recording medium
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1241 user area, i.e. the area of a disc where user data are to be recorded
• CPC Class Codes: G11B 2020/1244 CAV zone, in which a constant angular velocity is used
• CPC Class Codes: G11B 2020/1259 with ROM/RAM areas
• CPC Class Codes: G11B 2020/1265 Control data, system data or management information, i.e. data used to access or process user data

Abstract

When a removable medium is inserted, a medium information managing unit of a storing apparatus reads out medium information in a predetermined area and analyzes, thereby forming medium management information including access formats such as ROM, RAM, security in which a password is needed, and the like in correspondence to a plurality of partitions constructing a virtual medium by dividing an area in the medium into a plurality of data areas. When an input/output request is received from an upper apparatus, a command processing unit recognizes the access format of the target partition from the medium management information and executes a process corresponding to the access format.

Claims

1. A storing apparatus using a storing medium comprising:

a medium information reading unit for reading out prerecorded system information and access management information from a predetermined area of said storing medium when said storing medium is inserted;

a medium management information forming unit for forming medium management information, into a memory, including a password and/or an access kind code which is used for access permission of each of a plurality of logically divided data areas in said storing medium and bootable information indicative of the presence or absence of a boot program that is necessary for a boot process of said apparatus, in correspondence to said plurality of data areas by said system information and said access management information; and

a command processing unit for, when an access request command is received from an upper apparatus, discriminating a permission and an inhibition of the access for an address and the access kind of said access request command with reference to said medium management information, for executing said access request command if the access is possible, and for reporting an error if the access is inhibited.

2. An apparatus according to claim 1, wherein said system information is recorded in a predetermined logic block address in the data area of said storing medium and said access management information is recorded in an area which is other than a user area of said storing medium and which cannot be expressed by said logic block address.

3. An apparatus according to claim 1, wherein said access kind code is any one of a read access code in which only a read access is permitted, a read/write access code in which both of the read access and a write access are permitted, and a security code in which the access is permitted only when a collation coincidence of the password is obtained.

4. An apparatus according to claim 3, wherein in the case where a received password coincides with the password in the designated data area in said medium management information, said command processing unit updates the access kind code in said medium management information.

5. An apparatus according to claim 3, wherein as said access management information, the password and access kind code for every said data area have previously been recorded in said storing medium.

6. An apparatus according to claim 5, wherein when a received password coincides with the password in the designated data area, said command processing unit updates the access kind code in the access management information recorded in said storing medium.

7. An apparatus according to claim 3, wherein a flag is added to said security code and either a password indispensable mode in which a password is needed every access or an initial password mode in which a password is needed in the first access and no password is necessary at the second and subsequent times is selected by said flag.

8. An apparatus according to claim 3, wherein when the access request command is received for the data area in which said security code has been set, said command processing unit deletes said data area in the case where a collation coincidence of the password is not obtained.

9. An apparatus according to claim 1, wherein when the medium is ejected or when a power source of the apparatus is turned off, said medium management information forming unit clears the medium management information formed on the memory.

10. An apparatus according to claim 1, wherein said medium management information forming unit divides a medium area into one or a plurality of partitions and forms said medium management information.

11. An apparatus according to claim 1, wherein as said medium management information, said medium management information forming unit further forms format information indicative of a kind of format in each data area.

12. A storage control method using a storing medium, comprising:

a medium information reading step of reading out system information and access management information from a predetermined area of said storing medium when said storing medium is inserted;

a medium management information forming step of forming medium management information into a memory, including a password and/or an access kind code which is used for access permission of each of a plurality of logically divided data areas in said storing medium and bootable information indicative of the presence or absence of a boot program that is necessary for a boot process of said apparatus, in correspondence to said plurality of data areas by said system information and said access management information; and

a command processing step of, when an access request command is received, discriminating a permission and an inhibition of the access for an address and the access kind of said access request command with reference to said medium management information, executing said access request command if the access is possible, and reporting an error if the access is inhibited.

13. A method according to claim 12, wherein said system information is recorded in a head logic block address of said storing medium and said access management information is recorded in an area which is other than a user area of said storing medium and which cannot be shown by a logic block address.

14. A method according to claim 12, wherein in said command processing step, when the access kind code is received together with the password from an upper apparatus, in the case where said password coincides with the password in the designated data area in said medium management information, the access kind code in said medium management information is updated.

15. A method according to claim 12, wherein in said command processing step, in the case where a received password coincides with the password in the designated data area, the access kind code in said storing medium is updated.