This read-only Counter64 records the total number of packets received that were both undersized, under 64 octets, and carried a bad FCS, per its description, marking them as genuinely corrupted fragments rather than simply small-but-valid frames, which would instead count as UndersizePkts. This distinguishes a link or device actively producing malformed, broken frames from one merely sending legitimately small but well-formed traffic, which is an important distinction when diagnosing the root cause of receive errors during this bin's window. An engineer seeing a rise in this counter, as opposed to UndersizePkts, would suspect an actual physical-layer or NIC fault generating corrupt fragments rather than a benign non-standard traffic pattern.