Patent ID: 9632868
Date: 2017-04-25
CPC Classifications: G06F,G11C

Claim:
1. An operating method of a storage device which includes a nonvolatile memory and a memory controller configured to control the nonvolatile memory, the method comprising: performing a plurality of read operations with respect to data of the nonvolatile memory using first read parameters and second read parameters and collecting read histories associated with the plurality of read operations; determining first histories and second histories, based on the collected read histories; adjusting the second read parameters according to the first histories; and adjusting read parameters associated with the second histories, from among the first read parameters, according to the second histories, wherein: the read histories comprise information on read voltages used to perform the plurality of read operations, and the first histories and the second histories are determined from the collected read histories according to the number of read voltages, from among the read voltages, having the same level.