INFORMATION STORAGE DEVICE AND INFORMATION STORAGE METHOD
First Claim
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1. An information storage device comprising:
- a semiconductor memory; and
a management unit configured to keep track of a number of errors for each storage region of the semiconductor memory and to make unavailable a storage region having a tracked error number of two or more.
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Abstract
An information storage device includes a semiconductor memory divided into storage regions and a management unit. The management unit manages the storage regions so that any storage region which caused read or write errors a predetermined threshold number of times, which may be two or more, is made unavailable for storing data.
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Citations
20 Claims
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1. An information storage device comprising:
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a semiconductor memory; and a management unit configured to keep track of a number of errors for each storage region of the semiconductor memory and to make unavailable a storage region having a tracked error number of two or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reading data from a storage region of a nonvolatile semiconductor memory in an information storage device, the method comprising the step of:
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reading data from the storage region; and when a read error occurs while reading data from the storage region, registering the storage region as a provisionally available storage region, wherein the provisionally available storage region becomes an unavailable storage region when the number of read or write errors is greater than a predetermined threshold value. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of writing data to a storage region of a nonvolatile semiconductor memory in an information storage device, the method comprising the steps of:
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writing data to the storage region; and when a write error occurs while writing data to the storage region, registering the storage region as a provisionally available storage region, wherein the provisionally available storage region becomes an unavailable storage region when the number of read or write errors is greater than a predetermined threshold value. - View Dependent Claims (17, 18, 19, 20)
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Specification