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3 November 2026  John Weaver  Senior Program Developer
Last update by William Davis at 3 November 2026

Summary
Predicting physical storage failure requires systematic analysis of self-monitoring thresholds to evaluate hardware lifespan and data retention capabilities. Implementing standardized diagnostic protocols to check hard drive health smart status ensures accurate identification of underlying mechanical or solid-state degradation prior to disk redeployment.



Table of contents

table iconWhat SMART status tells you before you reuse a drive
table iconBest ways to check hard drive health SMART status on Windows and macOS
table iconHow to check SMART status step by step
table iconHow to confirm whether the drive is actually failing
table iconFAQ
A drive that suddenly slows down, stops opening files, or vanishes from File Explorer presents a stressful dilemma: is this just a file-system glitch, or is the physical disk failing? If your drive contains important files, your first priority should be securing them. Using a reliable data recovery tool such as Renee Undeleter is a crucial first step, allowing you to safely extract inaccessible files from a corrupted disk before performing any diagnostic checks.

＂Once your data is protected, it’s time to check hard drive health SMART status to decide if the physical disk is safe to format and reuse. SMART is the closest thing to a self-diagnosis system built into every modern drive.＂

It reveals early hardware failure signs that file checks won’t catch. The following checks are beginner-friendly, but also include an optional advanced method for those who need deeper insight.
how to check ssd health with crystaldiskinfo

What SMART status tells you before you reuse a drive

SMART (Self-Monitoring, Analysis and Reporting Technology) is integrated into most hard drives, SSDs, and NVMe drives. It tracks operating data such as read errors, bad sectors, spin-up time, temperature, and SSD wear, then summarizes overall health—typically as Good/Caution/Bad or Verified/Failing.

Stop writing, formatting, or reusing the disk until its health is verified.

Common warning signs that should prompt a SMART check include slow file access, freezing, clicking or grinding noises, missing files, random restarts, or boot errors. While these symptoms can also result from file-system corruption, they are strong enough that you should never assume the drive is safe.
SMART is designed to predict many physical failures, but it is not a 100% guarantee. A “Verified” or “Good” status is reassuring, but it’s not a lifetime warranty. If the drive shows a Caution or Bad status, treat it as potentially failing until you confirm otherwise.
CrystalDiskInfo health is declining
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Best ways to check hard drive health SMART status on Windows and Mac

Different methods provide varying levels of detail. Use the quick built-in check for a simple pass/fail answer, or a detailed reader to see the underlying attributes behind a Caution status.
Method Platform Detail Level Install Required Best For

Windows Settings / PowerShell (Built-in)

Windows

Basic overview

No

⚡ Quick drive health check

CrystalDiskInfo (GUI)

Windows

Detailed SMART data

Yes

🟢 Easy-to-read health status & thresholds

smartctl (CLI)

Windows/macOS/Linux

Full SMART diagnostics

Yes

🔧 Advanced troubleshooting & monitoring

Disk Utility (Built-in)

macOS

Basic health status

No

✅ Quick Verified / Failing checks

Note: Many external USB drives hide SMART data behind the enclosure’s bridge chip. If you connect an internal drive via USB and see no SMART information, try a direct SATA/NVMe connection or a different enclosure. CrystalDiskInfo is Windows-only, and macOS Disk Utility provides only basic SMART details rather than full attribute lists.
For detailed instructions, see the step-by-step section.

How to check SMART status step by step

Follow the platform-specific steps below. Each method offers a different level of detail, so choose the one that matches your operating system and comfort level.

Check Drive Health Using Built-in Windows Tools

If you only need a quick health assessment, Windows provides built-in tools that can report the overall condition of a drive without installing third-party software. This method is suitable for an initial check, helping you identify whether a drive is operating normally or showing potential issues.

Unlike dedicated SMART monitoring tools, Windows only reports a summarized health status and does not expose detailed SMART attributes such as reallocated sectors, temperature, or power-on hours.

[advanAndDisAdvan advan_txt="Advantages:" disadvan_txt="Disadvantages:" advan_con="No additional software required##Built directly into Windows##Fast health-status check##Suitable for basic diagnostics##" disadvan_con="Displays only an overall health status##No detailed SMART attributes##Limited troubleshooting information##" /]

Option 1: Check Drive Health in Windows Settings

Windows 11
1. Open Settings > System > Storage.
2. Click Advanced storage settings > Disks & volumes.
3. Select the physical drive you want to inspect.
4. Review the reported drive health information. If Windows reports a warning or indicates potential hardware issues, back up important data as soon as possible.
Windows 10
Microsoft does not provide the same drive-health interface found in Windows 11. For a quick built-in check, use PowerShell instead.

Option 2: Check Drive Health with PowerShell

1. Open Windows PowerShell or Windows Terminal as an administrator.
2. Run the following command:

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

3. Review the HealthStatus column:
- Healthy — No issues have been detected.
- Warning — Windows has detected a potential problem that should be investigated.
- Unhealthy — The drive may be failing. Back up critical data immediately and consider replacing the drive.
The Get-PhysicalDisk cmdlet provides a high-level health assessment for each physical disk. However, it does not display individual SMART attributes, error counters, temperature readings, or other diagnostic data available through specialized tools such as CrystalDiskInfo or smartctl.
Windows get physicaldisk command show smart info
If you want more detailed information, continue with the GUI reader below.

Windows detailed SMART reader

A free GUI tool like CrystalDiskInfo provides a much clearer view than Windows Settings. It reads the same SMART data but displays individual attributes, threshold values, and a color-coded health rating. The main window shows Good, Caution, or Bad at the top. If the health is Caution or Bad, don’t rely on the disk for important data until you identify which attribute triggered the warning. CrystalDiskInfo is free and can run as a portable app.
[advanAndDisAdvan advan_txt="Advantages:" disadvan_txt="Disadvantages:" advan_con="Color-coded Good/Caution/Bad summary##Shows individual SMART attributes and thresholds##Portable version can run without permanent installation##" disadvan_con="Windows-only##May not read some external USB drives behind bridge chips##Raw attribute names can still be confusing for beginners##" /]
how to check ssd health with crystaldiskinfo
After checking with the GUI, you may want to confirm the findings with another method. If your drive is in an external USB enclosure and no SMART data appears, try a different connection before assuming the drive is healthy.

macOS Disk Utility

For macOSusers, Disk Utility offers a simple way to perform a basic SMART check with no additional software. It’s built directly into macOS, making it easily accessible for anyone wanting to verify if a drive reports as Verified or Failing. While it doesn’t provide detailed SMART attributes, it’s an essential first step for macOSdiagnostics.
[advanAndDisAdvan advan_txt="Advantages:" disadvan_txt="Disadvantages:" advan_con="Built directly into macOS##No installation required##Simple pass/fail interface##" disadvan_con="Does not show detailed SMART attributes##Limited diagnostic capabilities##Cannot read external USB drives in some enclosures##" /]
1. Open Disk Utility from Applications > Utilities.
find mac disk utility
2. If the physical drive is not visible, select View > Show All Devices from the menu bar.
3. Select the physical drive (not just the volume or partition beneath it).
4. Check the S.M.A.R.T. Status field in the information panel. It should say Verified or Failing.
macos disk utility, S.M.A.R.T. Status
5. If it says Failing, replace the drive. If it says Verified but the disk still has issues, run First Aid to check the file system.
Disk Utility does not show detailed SMART attributes like reallocated or pending sectors, so this is only a basic check. Many external USB drives will also hide SMART details depending on the enclosure.

How to confirm whether the drive is actually failing

A single SMART reading is helpful, but the key is whether a problem is active or historical. Focus on these indicators:
SMART value Meaning Action

Reallocated Sectors Count

Sectors replaced by spare sectors after repeated errors

A few stable values may be acceptable; rising values mean replace

Current Pending Sector Count

Sectors waiting to be reallocated or repaired

Nonzero and rising means back up immediately

Uncorrectable Sector Count

Errors the drive could not fix

Nonzero or rising means replace

Temperature

Drive operating temperature

Follow drive limits; unusually high means check cooling or replace

SSD Percentage Used / Media Wear Indicator

How much of the SSD endurance has been consumed

Above 90% used means plan replacement

For example, a drive with 5 reallocated sectors that remains at 5 for six months may still be usable. If that same drive jumps from 5 to 40 in one week, it’s actively degrading.
The rule is simple: if the health status is Caution/Bad or any critical value is rising between two checks, back up immediately. If values have been stable for months, monitor monthly. Always cross-check with a second tool before retiring or reusing the drive, since a single misread or a bad USB bridge can trigger a false warning.

FAQ

Why does the drive feel slow even if SMART says “Verified”?

SMART mainly detects physical failure indicators, not file-system issues. A drive can show a Verified SMART status but still perform slowly due to file-system corruption, insufficient RAM, a faulty SATA cable, or severe fragmentation. Run chkdsk on Windows or First Aid on macOS to check the file system. Also, try the drive on another port or computer before assuming it’s healthy.
Command Prompt window displaying chkdsk scanning and fixing bad sectors

Are non-zero reallocated sectors always a sign of failure?

Not always. A small, stable number of reallocated sectors can be acceptable, especially on older drives. However, if the reallocated sector count increases every week or month, it’s a strong sign of physical deterioration. Record the current value and recheck it later before deciding to reuse the disk.

Is it safe to format and reuse a drive that shows a “Caution” status?

Generally, no. A Caution status means at least one SMART attribute has reached or is nearing its failure threshold. Formatting removes the file system but not the physical problem. You might use it temporarily for non-critical data, but always keep backups and expect failure. For important data, replace the drive.
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