Google Data Center Technician Practice Exam 2026 - Free Data Center Technician Practice Questions and Study Guide

CRC errors measure the integrity of the data link between the host controller and the drive. When the Cyclic Redundancy Check fails on frames transmitted over SATA/SAS, the system cannot trust the data on that link and must retry, so you see the error count rise. This is a symptom of a problem on the communication path, not necessarily the disk itself. The most common cause is a bad or loose cable or a poor connection on the SATA/SAS interface, though faulty connectors or interference can also trigger CRC errors. Because of that, the typical fix is to reseat or replace the cable, test with a different port, or swap in a known-good cable to isolate the issue. Overheating would affect drive health and SMART attributes, self-test failures point to internal drive testing results, and wear leveling relates to SSD flash management—none of these directly explain a rising CRC error count on the link.