5 Best Free Hard Drive Health Check Software Tools for HDDs and SSDs (2027)

Quick Comparison: Best Free HDD and SSD Health Check Software

The following five utilities are available free of charge and provide different approaches to storage diagnostics.

1. CrystalDiskInfo — Best Overall Free Hard Drive Health Checker

Official website:
CrystalDiskInfo

Best for: Home users, gamers, laptop owners, and anyone who wants a straightforward way to monitor HDD and SSD health.

CrystalDiskInfo is a free Windows utility developed by Crystal Dew World. It reads diagnostic information reported by compatible storage devices and presents it through a relatively simple interface.

Its main advantage is accessibility. Users can quickly inspect drive health indicators, temperatures, operating hours, and other diagnostic information without needing to interpret every raw S.M.A.R.T. value.

Key Features

• Displays S.M.A.R.T. attributes for supported HDDs and SSDs.
• Reports drive temperatures.
• Shows simplified health status indicators.
• Supports many SATA, NVMe, and USB-connected drives.
• Provides background monitoring and configurable alerts.
• Displays information such as firmware version, interface, and operating hours.

How CrystalDiskInfo Evaluates Drive Health

For many SATA drives, CrystalDiskInfo displays health states such as Good, Caution, or Bad.

For supported SSDs, it may also show a percentage-based health indicator.

However, these indicators must be interpreted carefully.

For example, an SSD showing 90% health does not necessarily have 90% of its total lifespan remaining. Depending on the model, this value may primarily represent estimated write endurance consumption.

Similarly, a mechanical hard drive reporting Good health may still have problems that are not captured by its available diagnostic attributes.

Advantages

• Completely free.
• Easy to use.
• Suitable for routine monitoring.
• Supports many modern NVMe SSDs.
• Lightweight.
• Provides useful temperature and health information.

Limitations

• Does not provide comprehensive surface scanning.
• Some S.M.A.R.T. attributes require technical interpretation.
• USB enclosure compatibility varies.
• Health percentages are not directly comparable between SSD manufacturers.

2. SeaTools — Best Free Software for Drive Diagnostic Tests

Official website:
Seagate SeaTools

Best for: Users who suspect a drive problem and want to perform diagnostic tests.

SeaTools is a free storage diagnostic utility developed by Seagate.

Unlike software primarily designed to display S.M.A.R.T. statistics, SeaTools focuses on actively testing supported storage devices.

Although developed by Seagate, supported versions can perform certain tests on drives from other manufacturers.

Key Features

• Short diagnostic tests.
• Extended diagnostic tests.
• Drive identification.
• Hardware-related diagnostic reporting.
• Support for compatible HDDs and SSDs.
• Bootable diagnostic options for supported environments.

Short vs. Long Diagnostic Tests

A short test performs a relatively quick diagnostic examination.

It is useful when you want an initial assessment of a drive that appears unstable.

A long test performs a more extensive examination and may help identify problems that shorter tests miss.

However, the exact tests available depend on the drive model, interface, firmware, and SeaTools version.

A successful test does not guarantee that the drive will remain reliable.

When Should You Use SeaTools?

SeaTools is particularly useful when a drive exhibits symptoms such as unusually slow file access, intermittent read failures, or unexpected storage errors.

It can also provide additional evidence when CrystalDiskInfo reports a concerning health indicator.

Advantages

• Free.
• Developed by a major drive manufacturer.
• Offers actual diagnostic tests.
• Supports many drives from other manufacturers.
• Useful for troubleshooting suspected hardware failures.

Limitations

• Not intended primarily for continuous monitoring.
• Available tests vary between drives.
• Extended tests can take considerable time.
• Some advanced functions are manufacturer-specific.

3. GSmartControl — Best Free Open-Source Graphical Diagnostic Tool

Official website:
GSmartControl

Best for: Technicians and advanced users who want detailed diagnostic information without relying on simplified health scores.

GSmartControl is a graphical interface for smartctl, a utility included in the open-source smartmontools project.

It provides access to extensive S.M.A.R.T. information while avoiding the need to enter command-line instructions manually.

Key Features

• Detailed S.M.A.R.T. attribute reporting.
• Drive identity information.
• Supported diagnostic self-tests.
• Device error logs.
• Temperature information.
• Open-source licensing.

Why Detailed S.M.A.R.T. Data Matters

Simplified health indicators are useful, but they can hide important details.

For example, a mechanical HDD may have a small number of reallocated sectors without immediately triggering an overall health warning.

GSmartControl allows users to inspect available attributes and determine whether relevant values are changing.

A rising pending sector count, for example, may warrant investigation even if the drive has not yet reported a formal S.M.A.R.T. failure.

Self-Test Capabilities

GSmartControl can initiate self-tests supported by the drive and the underlying smartctl implementation.

Traditional ATA drives may offer short, extended, and conveyance self-tests.

NVMe devices use different diagnostic mechanisms, and self-test support varies.

Advantages

• Free and open source.
• Detailed diagnostic reporting.
• Useful error logs.
• Self-test support.
• Suitable for technical troubleshooting.

Limitations

• More technical than CrystalDiskInfo.
• Some raw values are manufacturer-specific.
• Device compatibility depends on the connection method.
• Not all USB adapters support diagnostic command pass-through.

4. HDDScan — Best Free Tool for HDD Surface and Read Testing

Official website: 
HDDScan

Best for: Investigating slow sectors, read problems, and suspected surface issues on mechanical hard drives.

HDDScan is a free Windows storage diagnostic utility that provides S.M.A.R.T. reporting and several types of storage access tests.

Its surface testing capabilities make it particularly useful when diagnosing aging HDDs.

Key Features

• Read testing.
• Verify testing.
• Block response-time analysis.
• S.M.A.R.T. reporting.
• Temperature monitoring for supported drives.
• Portable operation.

What Can Surface Testing Reveal?

Mechanical HDDs store data on rotating magnetic platters.

When a sector becomes difficult to read, the drive may require additional attempts before successfully retrieving the data.

During a read test, HDDScan can report unusually slow responses.

These results may help identify problematic regions.

However, slow response times do not automatically indicate physical damage.

Background disk activity, controller behavior, interface problems, and power management can also influence performance.

Important Warning About Destructive Tests

Is HDDScan Useful for SSDs?

HDDScan can work with some SSDs, but traditional surface-testing techniques are less informative for flash-based storage.

Modern SSDs use logical-to-physical address translation, wear leveling, and internal bad-block management.

Consequently, scanning logical blocks does not directly reveal the physical condition of individual NAND flash cells.

For SSD health monitoring, S.M.A.R.T. information and manufacturer-specific diagnostics are generally more useful.

Advantages

• Free.
• Portable.
• Useful read-response analysis.
• Provides S.M.A.R.T. information.
• Helpful for troubleshooting older HDDs.

Limitations

• Technical interface.
• Some operations are destructive.
• Limited relevance of HDD-style surface testing to SSD wear.
• Feature support varies by interface and controller.

5. smartmontools — Best Free Command-Line HDD and SSD Health Checker

Official website:
smartmontools

Best for: System administrators, IT technicians, power users, and anyone who wants scriptable storage diagnostics.

smartmontools is a free, open-source collection of utilities for monitoring and diagnosing storage devices.

Its primary components include:

• smartctl: A command-line utility for querying diagnostic information and initiating supported tests.
• smartd: A monitoring daemon that can periodically check supported drives and report certain warning conditions.

smartmontools supports Windows and several other operating systems.

It is particularly useful because it provides detailed access to drive-reported diagnostic information and can be integrated into automated maintenance workflows.

Key Features

• Detailed S.M.A.R.T. information.
• ATA and NVMe diagnostic support.
• Device error logs.
• Supported drive self-tests.
• Command-line automation.
• Monitoring through smartd.
• Free and open-source licensing.

How to Check Drive Health With smartctl on Windows

Install smartmontools from the official project website.

Then open an elevated Command Prompt or PowerShell session.

To identify available devices, run:

smartctl --scan-open

The output lists detected devices and suggested device types.

Next, use the device path reported by the scan.

For example:

smartctl -a /dev/sda

This requests available diagnostic information for the selected device.

On a supported NVMe SSD, the command can provide information such as temperature, percentage used, available spare, and media errors.

To display health-related status information:

smartctl -H /dev/sda

For compatible drives, you can initiate a short self-test:

smartctl -t short /dev/sda

After the test has completed, examine available self-test results using:

smartctl -l selftest /dev/sda

Why smartmontools Is Useful for Windows Administrators

Unlike GUI-only monitoring utilities, smartmontools can be used in scripts and automated diagnostic workflows.

For example, administrators can periodically collect drive information and compare error counters over time.

This can help identify changes that might otherwise go unnoticed.

However, reliable automated alerting requires appropriate configuration and understanding of the diagnostic values being monitored.

Advantages

• Completely free and open source.
• Extensive technical diagnostics.
• Supports many ATA, SATA, SCSI, and NVMe devices.
• Suitable for automation.
• Provides detailed error logs and self-test information.
• Available across multiple operating systems.

Limitations

• Command-line interface requires familiarity.
• Some device commands need administrator privileges.
• Hardware compatibility varies.
• Interpreting raw S.M.A.R.T. data can be difficult.

Which Free Hard Drive Health Checker Should You Choose?

The best software depends on the type of problem you want to investigate.

For most Windows users, combining CrystalDiskInfo for regular monitoring with SeaTools for additional diagnostic testing provides a practical approach.

How to Check HDD and SSD Health on Windows 11 and Windows 10

The simplest approach is to start with CrystalDiskInfo and examine the drive’s reported diagnostic information.

Step 1: Download CrystalDiskInfo

Visit the
official CrystalDiskInfo download page
.Download the appropriate version and launch the application.

Step 2: Select Your Drive

CrystalDiskInfo should display supported storage devices detected by Windows.

If your computer contains multiple drives, select the device you want to examine.

Step 3: Review the Health Status

Look for the displayed health indicator.

A Good status generally means the utility has not detected conditions that trigger its configured warning criteria.

A Caution or Bad status indicates that additional investigation may be necessary.

Step 4: Check the Temperature

Compare the reported temperature with the operating limits specified by the drive manufacturer.

There is no universal safe temperature that applies to every HDD and SSD.

Step 5: Examine Important Diagnostic Attributes

For mechanical HDDs, useful indicators include:

• Reallocated Sector Count.
• Current Pending Sector Count.
• Offline Uncorrectable Sector Count.

For NVMe SSDs, important indicators include:

• Percentage Used.
• Available Spare.
• Critical Warning.
• Media and Data Integrity Errors.

If you find concerning values, protect your data before performing additional tests.

Understanding Important HDD S.M.A.R.T. Attributes

S.M.A.R.T. stands for Self-Monitoring, Analysis and Reporting Technology.

It allows compatible drives to report selected operating statistics and diagnostic conditions.

However, S.M.A.R.T. attributes are not completely standardized across all manufacturers.

In particular, raw values for some ATA attributes are vendor-specific.

Reallocated Sector Count

Common ATA attribute ID: 05

This attribute typically tracks sectors that have been replaced with spare sectors.

A nonzero value can indicate previous media problems.

An increasing count deserves particular attention because it may indicate ongoing deterioration.

Current Pending Sector Count

Common ATA attribute ID: C5 / 197

Pending sectors are sectors that the drive has identified as potentially unreliable. They may be awaiting successful rereading or reassessment following a write. An increasing pending sector count can indicate developing media problems.

Offline Uncorrectable Sector Count

Common ATA attribute ID: C6 / 198

This attribute generally reports uncorrectable sectors detected during certain offline operations. Nonzero or increasing values may indicate unreadable data.

Power-On Hours

Common ATA attribute ID: 09

Power-On Hours reports accumulated operating time, although reporting conventions may vary. High operating hours alone do not prove that a drive is failing. Reliability also depends on operating conditions, workload, design, and manufacturing variation.

How to Interpret SSD Health Indicators

SSDs require a different diagnostic approach because they use flash memory rather than rotating magnetic platters. For NVMe SSDs, several standardized health indicators are particularly useful.

1. Percentage Used

The NVMe Percentage Used field represents a manufacturer-provided estimate of consumed endurance. For example, a value of 10% generally indicates relatively little of the estimated endurance has been consumed. A value of 100% indicates that the manufacturer’s estimated endurance limit has been reached. However, reaching 100% does not mean the SSD will immediately fail. Similarly, a low Percentage Used value does not guarantee that the drive cannot experience controller or electronic failures.

2. Available Spare

Available Spare indicates the device-reported percentage of remaining spare capacity. A declining value may suggest increasing consumption of reserve flash capacity. NVMe devices also report an Available Spare Threshold. Crossing that threshold can trigger a critical warning.

3. Media and Data Integrity Errors

This NVMe counter records certain unrecovered data integrity errors detected by the controller. An increasing count warrants investigation. However, not every filesystem or application error is reflected in this counter.

4. Critical Warning

NVMe SSDs expose a Critical Warning field that can indicate conditions such as:

• Available spare below the threshold.
• Temperature outside an acceptable range.
• Reliability degradation.
• Read-only media conditions.
• Volatile memory backup problems, where applicable.

A nonzero value should be investigated.

5. Temperature

High SSD temperatures can cause thermal throttling. Thermal throttling occurs when a controller reduces performance to keep the device within its intended operating limits. Temperature thresholds differ between SSD models. Always use the manufacturer’s specifications when evaluating operating temperatures.

HDD vs. SSD Health Checks: What’s Different?

A full read scan is not equivalent to a comprehensive SSD health test.

Modern SSD controllers manage physical flash locations internally using wear leveling, error correction, and logical-to-physical address translation. Consequently, software that reads logical storage blocks cannot directly inspect every physical flash cell.

How to Check Drive Health Using Windows Built-In Tools

Windows 11 and Windows 10 include storage management capabilities that can provide limited health information.

Method 1: Windows 11 Settings

On supported Windows 11 systems, navigate to:

Settings > System > Storage > Advanced storage settings > Disks & volumes

Select a disk and open its properties. For compatible NVMe SSDs, Windows may display information such as estimated remaining life, temperature, and available spare capacity. This functionality is not available for every drive. In particular, many SATA and USB-connected devices do not expose equivalent information through Windows Settings.

Method 2: PowerShell

Open PowerShell as an administrator.

Run:

Get-PhysicalDisk | Select-Object FriendlyName, MediaType, HealthStatus, OperationalStatus

This displays health and operational information for disks recognized by the Windows Storage Management subsystem. Possible health states include Healthy, Warning, and Unhealthy. However, a Healthy result does not indicate that Windows has performed a complete physical diagnostic examination. To request additional reliability information, run:

Get-PhysicalDisk | Get-StorageReliabilityCounter

Depending on hardware support, this may return temperatures, wear information, or selected error counters. Some values may be missing or unavailable.

Does CHKDSK Check Hard Drive Health?

CHKDSK is a Windows utility primarily designed to examine and repair filesystem structures. It is not a replacement for S.M.A.R.T. monitoring or manufacturer diagnostic tools. To examine a volume for filesystem errors, run:

chkdsk C:

Repair filesystem errors using:

chkdsk C: /f

To locate bad sectors and attempt recovery of readable information:

chkdsk C: /r

The /r option includes the functionality of /f. On a system volume, Windows may need to schedule the repair for the next restart.

CHKDSK can repair certain logical filesystem problems, but it cannot fix damaged drive electronics, mechanical defects, or worn-out flash memory.

7 Warning Signs Your HDD or SSD May Be Failing

1. Unusual Clicking or Grinding Noises

Repeated abnormal clicking or grinding can indicate mechanical problems in an HDD. SSDs contain no moving mechanical components.

2. Frequent Read or Write Errors

Repeated file access failures may indicate storage problems, although faulty cables, software issues, and memory errors can produce similar symptoms.

3. Unexpected File Corruption

Files that repeatedly become corrupted may indicate storage faults or problems elsewhere in the system.

4. Random Drive Disconnections

A drive that repeatedly disappears from Windows may have connection, power, controller, firmware, or internal hardware problems.

5. Extremely Slow File Access

Unexpectedly slow reads can indicate problematic storage regions, particularly on mechanical HDDs.

6. Increasing S.M.A.R.T. Error Counts

A worsening trend in relevant error counters is an important reason to investigate drive reliability.

7. Failed Diagnostic Tests

A failed manufacturer diagnostic test warrants investigation and may indicate that drive replacement is necessary.

What Should You Do If Your Hard Drive Health Is Bad?

Step 1: Protect Important Data

If the drive remains accessible, prioritize copying irreplaceable files to another healthy storage device. For drives showing severe mechanical symptoms, professional data recovery may be safer than continued testing.

Step 2: Record Diagnostic Information

Save the drive model, S.M.A.R.T. attributes, relevant error counts, and diagnostic results. This information may help with troubleshooting or warranty claims.

Step 3: Check Connections

For SATA drives, faulty cables or power connections can cause communication errors. External drives may also experience problems caused by defective USB cables or enclosures.

Step 4: Run Additional Tests When Safe

Once important data is protected, consider running an appropriate diagnostic test. SeaTools or a manufacturer-specific utility may provide additional information.

Step 5: Replace the Drive When Necessary

Software cannot reverse physical wear or repair defective electronic components. If a drive exhibits ongoing reliability problems, replacement is generally safer than waiting for complete failure.

How Often Should You Check HDD and SSD Health?

There is no universally required monitoring interval. For a typical personal computer, reviewing storage health approximately once a month is a reasonable maintenance habit. Business-critical systems benefit from automated monitoring and alerting.

Monitoring helps identify warning signs, but regular verified backups remain the most important protection against data loss.

Frequently Asked Questions

What is the best free hard drive health check software for Windows 11?

CrystalDiskInfo is the best overall choice for most Windows 11 users because it provides S.M.A.R.T. information, temperature monitoring, and simplified health indicators for many HDDs and SSDs.

What is the best free SSD health checker?

CrystalDiskInfo is an excellent general-purpose SSD health checker. For supported SSDs, manufacturer-specific utilities may provide additional diagnostic information.

Can I check hard drive health without installing software?

Yes. Windows provides limited storage health information through PowerShell and, for supported devices, Windows 11 Settings.

Is CrystalDiskInfo safe to use?

Yes, when downloaded from the official developer website. CrystalDiskInfo primarily reads diagnostic information and does not need to perform destructive tests to display drive health.

Is 90% SSD health good?

A reported 90% SSD health value is generally not concerning by itself. However, its meaning depends on the drive and software. It should not be interpreted as a guarantee of remaining operating life.

Can a hard drive show 100% health and still fail?

Yes. S.M.A.R.T. monitoring cannot predict every hardware failure. Controllers, electronic components, and mechanical parts can fail without producing advance warnings.

Can bad sectors be repaired?

Logical filesystem errors can sometimes be repaired. Physical media damage generally cannot be repaired through software. Drives may remap defective storage areas, but this does not restore damaged physical media.

Does formatting fix S.M.A.R.T. errors?

Usually not. Formatting does not repair failing hardware, defective electronics, or worn-out flash memory.

Does SSD health decrease over time?

Many SSDs report increasing endurance consumption as data is written. However, write endurance is only one aspect of SSD reliability, and drives can fail for reasons unrelated to flash wear.

Can hard drive health software recover deleted files?

Generally, no. Health monitoring utilities are designed for diagnostics rather than file recovery. Data recovery requires different tools or specialized services.

Final Verdict: The Best Free HDD and SSD Health Check Software

All five utilities covered in this guide provide useful storage diagnostic capabilities without requiring a commercial software license.

However, each tool serves a different purpose.

1. CrystalDiskInfo: Best overall for routine HDD and SSD monitoring.
2. SeaTools: Best for running drive diagnostic tests.
3. GSmartControl: Best open-source graphical diagnostic utility.
4. HDDScan: Best for investigating HDD read performance and surface issues.
5. smartmontools: Best for command-line diagnostics and automated monitoring.

For most Windows users, CrystalDiskInfo is the best place to start.

If a drive begins showing concerning symptoms, SeaTools or an appropriate manufacturer diagnostic utility can provide additional information.

Advanced users and administrators may prefer GSmartControl or smartmontools for detailed access to diagnostic attributes, error logs, and supported self-tests.

References and Official Sources

The following resources provide official software downloads, technical documentation, and research relevant to HDD and SSD diagnostics.

1. Crystal Dew World — CrystalDiskInfo.
   Official software documentation and downloads.
   https://crystalmark.info/en/software/crystaldiskinfo/
   
2. Seagate — SeaTools.
   Official storage diagnostic software.
   https://www.seagate.com/support/downloads/seatools/
   
3. GSmartControl Project.
   Graphical interface for smartctl.
   https://gsmartcontrol.shaduri.dev/
   
4. HDDScan.
   Official diagnostic software website.
   https://hddscan.com/
   
5. smartmontools Project.
   Open-source storage monitoring utilities.
   https://www.smartmontools.org/
   
6. Microsoft Learn — Get-PhysicalDisk.
   Windows PowerShell storage documentation.
   https://learn.microsoft.com/en-us/powershell/module/storage/get-physicaldisk
   
7. Microsoft Learn — Get-StorageReliabilityCounter.
   Storage reliability counter documentation.
   https://learn.microsoft.com/en-us/powershell/module/storage/get-storagereliabilitycounter
   
8. Microsoft Learn — CHKDSK.
   Windows filesystem checking and repair documentation.
   https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/chkdsk
   
9. Pinheiro, Weber, and Barroso (2007).
   Failure Trends in a Large Disk Drive Population.
   Google Research
   
10. NVM Express.
    Official NVMe specifications and technical documentation.
    https://nvmexpress.org/specifications/
    
11. Backblaze — Drive Stats.
    Operational storage reliability data.
    Backblaze Drive Statistics