STORAGE DEVICE AND RELIABILITY VERIFICATION METHOD
First Claim
1. A method controlling the execution of a reliability verification operation in a storage device including a nonvolatile memory device and a memory controller, the method comprising:
- determining whether a read count for a designated unit within the nonvolatile memory device exceeds a count value limit; and
upon determining that the read count exceeds the count value limit, executing the reliability verification operation directed to the designated unit,wherein the count value limit is based on at least one of read count information, page bitmap information and environment information stored in the storage device.
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Accused Products
Abstract
A method controlling the execution of a reliability verification operation in a storage device including a nonvolatile memory device includes; determining whether a read count for a designated unit within the nonvolatile memory device exceeds a count value limit, and upon determining that the read count exceeds the count value limit, executing the reliability verification operation directed to the designated unit, wherein the count value limit is based on at least one of read count information, page bitmap information and environment information stored in the storage device.
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Citations
23 Claims
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1. A method controlling the execution of a reliability verification operation in a storage device including a nonvolatile memory device and a memory controller, the method comprising:
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determining whether a read count for a designated unit within the nonvolatile memory device exceeds a count value limit; and upon determining that the read count exceeds the count value limit, executing the reliability verification operation directed to the designated unit, wherein the count value limit is based on at least one of read count information, page bitmap information and environment information stored in the storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a storage device including a nonvolatile memory device and a memory controller controlling operation of the nonvolatile memory device, the method comprising:
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maintaining in the nonvolatile memory device a read count table listing a number of read requests directed to each one of a plurality of designated units within the nonvolatile memory device; upon receiving a read request direct to memory cells of a selected word line, determining whether to execute a dummy read operation in response to a read count stored in the read count table and state information associated with an unselected word line; executing the dummy read operation directed to either memory cells connected to an open word line, or memory cells connected to a word line adjacent to the selected word line; determining whether to execute a read reclaim operation based on a result of executing the dummy read operation; and executing the read reclaim operation directed to a memory block including the memory cells connected to the selected word line. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A storage device comprising:
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a nonvolatile memory device including a plurality of memory blocks; and a memory controller configured to control the nonvolatile memory device, wherein in response to a read request identifying a memory block among the plurality of memory blocks, the memory controller is configured to execute a reliability verification operation directed to the memory block in response to one of a read count and environmental information, and the read count and state information associated with an unselected word line. - View Dependent Claims (20, 21, 22, 23)
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Specification