These guides focus on interpreting reported drive-health information. They do not provide software, installers or redirects to third-party services.
For the quickest path, read the main-window guide first, then continue to the pages about Caution status and S.M.A.R.T. values.
All related pages
CrystalDiskInfo is a Windows drive-health utility that reads HDD, SSD and NVMe information and S.M.A.R.T. telemetry.
How to Read CrystalDiskInfoA field-by-field guide to the main window so you can understand what CrystalDiskInfo is reporting.
S.M.A.R.T. Values ExplainedUnderstand the columns in the S.M.A.R.T. table and why raw numbers must be interpreted conservatively.
What Caution and Bad MeanA practical, conservative response plan for CrystalDiskInfo Caution and Bad health status.
HDD Attributes 05, C5 and C6What the common HDD sector-warning attributes mean and why the trend matters.
SSD Health Percentage ExplainedSSD health percentages usually describe consumed endurance, not a precise remaining-life calendar.
NVMe S.M.A.R.T. Values ExplainedA practical guide to common NVMe health log fields shown by CrystalDiskInfo.
Drive Temperature GuideUnderstand temperature readings without relying on one universal safe number for every HDD, SSD and NVMe drive.
Power On Hours ExplainedPower-on time is useful context, but it does not automatically determine whether a drive is healthy or bad.
C7 Interface CRC Error CountC7 usually points to communication errors between a SATA drive and the host, not directly to media wear.
External Drive Not DetectedExternal-drive visibility depends on Windows, the USB bridge, the enclosure and the storage controller path.
Monitoring Drive HealthMonitoring helps you notice changes, but changing thresholds does not repair a physical drive.