Checking hard drive health mainly means reading its SMART (Self-Monitoring, Analysis, and Reporting Technology) data, which every modern hard drive and SSD tracks internally. Windows includes a basic built-in check, while free third-party tools like CrystalDiskInfo provide a much more detailed and readable breakdown of a drive’s actual condition.

Key Takeaways
  • SMART data is built into every modern drive, tracking real health indicators.
  • CrystalDiskInfo gives a clear color-coded health status most people can read easily.
  • Reallocated sector count and pending sector count are key warning metrics.
  • Regular health checks help you replace a drive before it fails unexpectedly.

Quick Check: Windows Built-In Method

  1. Open Command Prompt.
  2. Type wmic diskdrive get status and press Enter.
  3. A result of “OK” indicates basic SMART status is passing; anything else warrants further investigation.

This built-in check is fast but very limited, only giving a pass/fail result without the detailed metrics a dedicated tool provides.

Detailed Check: CrystalDiskInfo

The free tool CrystalDiskInfo reads full SMART data and presents it with a simple color-coded status: blue for good, yellow for caution, and red for a drive at risk of failure. It’s widely recommended by hardware sites including Tom’s Hardware as the go-to free tool for this purpose.

Key SMART Metrics to Watch

  • Reallocated Sector Count: sectors the drive has had to remap due to damage; a rising number signals aging media, related to bad sectors
  • Pending Sector Count: sectors currently flagged as unstable, awaiting reallocation or confirmation of failure
  • Temperature: sustained high operating temperature can accelerate wear on both HDDs and SSDs
  • Power-On Hours: total lifetime runtime, useful context alongside other health metrics

Checking SSD Health Specifically

CrystalDiskInfo also works for SSDs, though manufacturer-specific tools like Samsung Magician or Crucial’s Storage Executive often provide additional SSD-specific metrics like total data written, covered further in how long does an SSD last.

How Often Should You Check?

Checking every few months is reasonable for most home users, though checking immediately after noticing any unusual behavior, slowdowns, unusual sounds, or file errors, is worthwhile regardless of your regular schedule.

What to Do If Health Status Shows a Warning

Back up your data immediately, regardless of how severe the warning appears, since SMART data indicates elevated risk rather than a precise failure timeline. See signs of SSD failure or hard drive not showing up for further symptom-based confirmation.

Practical habit: make checking drive health part of your routine PC maintenance alongside regular cleaning, since catching a warning early gives you time to back up and replace a drive before it fails unexpectedly.

Frequently Asked Questions

What’s the easiest way to check my drive’s health?

CrystalDiskInfo, a free tool that reads SMART data and presents a simple color-coded health status.

What does a rising reallocated sector count mean?

It signals the drive has had to remap increasingly more damaged sectors, indicating aging media and elevated failure risk.

Does checking drive health work for SSDs too?

Yes, CrystalDiskInfo works for SSDs, though manufacturer-specific tools often provide additional useful SSD metrics.

How often should I check my drive’s health?

Every few months is reasonable, plus immediately after noticing any unusual slowdowns, sounds, or file errors.