1. A method of fault detection in a storage device, the method comprising: while in normal operation: measuring electrical current drawn during performance of a respective operation on a specified portion of the storage device and recording data corresponding to the measured electrical current drawn during performance of the respective operation on the specified portion of the storage device; analyzing the recorded data, including determining whether one or more predefined characteristics of the recorded data meets predetermined failure criteria; and in accordance with a determination that the recorded data meets the predetermined failure criteria, performing one or more remedial actions, the one or more remedial actions including marking the specified portion of the storage device as a known-bad portion.