Data storage device
A data storage device includes: a recording medium that has two or more system data recording areas where system data are recorded on a multiple basis, and a user data recording area where user data is recorded; a head that writes and reads data into and from the recording medium; and a system data update control section that causes the head to update the system data on the recording medium. The system data update control section causes the head to record new system data on a multiple basis in another sub-record area that is alternately selected at each update to the new system data over the two or more system data recording areas when each the two or more system data recording areas is divided into two sub-record areas, and read the new system data from the another sub-record area to confirm that the new system data is recorded correctly.
1. A data storage device comprising:
a recording medium that has two or more system data recording areas on which system data are recorded on a multiple basis, and a user data recording area on which user data is recorded;
a head that records data into the recording medium and reads data from the recording medium; and
a system data update control section that causes the head to update the system data on the recording medium,
wherein the system data update control section causes the head to record new system data on a multiple basis in another sub-record area that is alternately selected at each update to the new system data over the two or more system data recording areas when each the two or more system data recording areas is divided into two sub-record areas, and read the new system data from the another sub-record area to confirm that the new system data is recorded correctly.
2. The data storage device according to claim 1 , wherein the system data update control section causes the head to record new system data on a multiple basis in other sub-record area that is different from the another sub-record area now selected at each update to the new system data over the two or more system data recording areas, and omits regarding the other sub-record area the confirmation that the new system data is recorded correctly.
3. The data storage device according to claim 2 , wherein the data storage device further comprising:
an access result preservation section that preserves an access result of an indication of failure when failing in update of the system data about each the two or more system data recording areas,
and wherein the system data update control section causes the head to execute the update of the new system data regarding a system data recording area excepting a system data recording area which preserves an access result of indicating the failure in the update of the system data in the access result preservation section, of the two or more system data recording areas.
4. The data storage device according to claim 3 , wherein the access result preservation section records and reads the system data on each the two or more system data recording areas, and preserves the access result, and
the system data update control section causes the head to record new system data on a system data recording area excepting a system data recording area which preserves an access result of indicating the failure in the record and read of the system data in the access result preservation section, of the two or more system data recording areas, and read the new system data from a system data recording area which succeeds in recording of the new system data to confirm that the new system data is recorded correctly.
5. The data storage device according to claim 4 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
6. The data storage device according to claim 3 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
7. The data storage device according to claim 2 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
8. The data storage device according to claim 1 , wherein the data storage device further comprising:
an access result preservation section that preserves an access result of an indication of failure when failing in update of the system data about each the two or more system data recording areas,
and wherein the system data update control section causes the head to execute the update of the new system data regarding a system data recording area excepting a system data recording area which preserves an access result of indicating the failure in the update of the system data in the access result preservation section, of the two or more system data recording areas.
9. The data storage device according to claim 8 , wherein the access result preservation section records and reads the system data on each the two or more system data recording areas, and preserves the access result, and
the system data update control section causes the head to record new system data on a system data recording area excepting a system data recording area which preserves an access result of indicating the failure in the record and read of the system data in the access result preservation section, of the two or more system data recording areas, and read the new system data from a system data recording area which succeeds in recording of the new system data to confirm that the new system data is recorded correctly.
10. The data storage device according to claim 9 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
11. The data storage device according to claim 8 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
12. The data storage device according to claim 1 , wherein the data storage device is connected with an external device, and
wherein the data storage device further comprises:
a success number computing section that computes number of the system data recording areas that succeed in update among the two or more system data recording areas, and
a notification section that notifies the external device of breakdown of the data storage device when number of system data recording areas computed in the success number computing section is smaller than that of a prescribed threshold.
13. A data storage device comprising:
a recording medium that has two or more system data recording areas on which system data are recorded on a multiple basis, and a user data recording area on which user data is recorded;
a head that records data into the recording medium and reads data from the recording medium;
a buffer that temporarily preserves system data read with the head, the buffer having two or more division areas;
a deletion section that deletes the system data recorded on the buffer; and
a system data read control section that causes the head to read the system data recorded on the two or more system data recording areas,
wherein when the system data read control section causes the head to read sequentially system data recorded on the two or more system data recording areas, and preserves sequentially the system data in the buffer, latest system data is obtained by repetition of a process in which at stage that two system data older read is preserved in the buffer, old and new of the two system data are compared with one another, and the system data since the third is overwritten on the older system data on the buffer and old and new of two system data on the buffer is compared with one another, and
the deletion section deletes data preserved in the buffer after the system data read control section obtains the latest system data.
14. The data storage device according to claim 13 , wherein the system data includes a password that permits the access of the data storage device.