Nonvolatile storage reflow detection

摘要

A non-volatile storage system includes non-volatile storage elements and one or more managing circuits in communication with the non-volatile storage elements. The non-volatile storage elements are arranged in blocks including a first block reserved for system use and a second block. The first block stores a pre-determined data pattern that was written to the first block subsequent to system testing and prior to completion of manufacturing of the non-volatile storage system. Subsequent to completion of manufacturing of the non-volatile storage system, the one or more managing circuits sense information stored in the first block and determine an error metric for the sensed information with respect to the pre-determined data pattern. The one or more managing circuits determine that the system experienced an IR reflow process if the error metric was determined to satisfy the threshold.

主权项

1. A method for operating a non-volatile storage system, comprising:
identifying a first block storing first data, the first data is already known without having to read from the first block; sensing information for non-volatile storage elements connected to one or more word lines in the identified first block, the non-volatile storage elements connected to one or more word lines store at least a portion of the first data; determining an error metric for the sensed information; determining whether the error metric satisfies a threshold; and identifying that a second block has been subjected to a reflow process if the error metric satisfies the threshold, the second block does not store the first data, the second block stores preloaded data.