1. A system for scanning in a data storage system, the system comprising: a first spot scanner coupled with a carriage, the carriage configured to move in at least a scan direction and to rotate about a reference axis to point the first spot scanner in a detection direction, such that, when the detection direction is perpendicular to the scan direction, the detection direction and the scan direction define four quadrants of the carriage, the first spot scanner being in one of the four quadrants; a second spot scanner coupled with the carriage in another of the four quadrants; a driver configured to move the carriage in the scan direction to sweep the spot scanners to acquire raw scan data at each of a plurality of locations within at least one scan window; and a processor, in communication with the spot scanners, and configured to: direct at least one of the spot scanners to acquire the raw scan data; decode the raw scan data to generate a scan profile for a purported feature within the at least one scan window; and analyze the scan profile to determine a valid feature corresponding to the purported feature and a feature characteristic associated with the valid feature.