How to Check HDD or SSD Health Before Selling Your PC
Selling a used laptop or PC without checking the drive health is one of the most common mistakes South Africans make when listing on Gumtree or Facebook Marketplace. A failing drive can cause a buyer serious problems within weeks, and ignoring this step can lead to disputes, chargebacks, or worse.
By the end of this guide, you will know how to run a free health check on your HDD or SSD, understand what the results mean, and complete a pre-sale process that protects both you and the buyer. You will also know exactly how to wipe your personal data before handing over any device.
Note for South Africa:
- South Africa’s Consumer Protection Act (CPA) No. 68 of 2008 requires suppliers to disclose known defects. If you sell used electronics as a business, this applies to you directly.
- Under POPIA (Protection of Personal Information Act), selling a device with personal data still on it could constitute a privacy breach. A secure wipe is not optional.
- Eskom load shedding is hard on HDDs. Unexpected power cuts during write operations can cause reallocated sectors. If your area has had heavy outages, check your drive’s SMART data carefully before listing.
At a glance:
- Use CrystalDiskInfo (free, Windows) to read your drive’s SMART health status in under 5 minutes.
- A "Good" status is safe to list. A "Caution" status must be disclosed. A "Bad" status means the drive should not be sold as functional.
- SSDs wear through write cycles. Check total bytes written against your drive’s rated TBW (terabytes written) figure.
- Never sell a device without a secure wipe. A standard factory reset or quick format is not enough.
Key takeaways:
- Drive health checks take less than 10 minutes and cost nothing.
- Honest disclosure of drive health builds trust and can justify a higher asking price.
- Wiping personal data properly is both a practical and legal obligation in South Africa.
Why Checking Drive Health Matters Before You Sell or Buy
Your hard drive or SSD is the part of a computer that holds all stored data, including the operating system, files, and applications. When it fails, the device becomes unusable until the drive is replaced. A drive that is close to failure is not a product worth selling at full price.
For sellers, a health check protects your reputation. For buyers, it is a basic due-diligence step before handing over any money. Either way, a 5-minute check with a free tool tells you most of what you need to know.
What Happens If You Skip This Step
Sellers who skip a drive health check risk selling a device that fails within weeks. This leads to disputes on Gumtree and Facebook Marketplace, where there is no formal buyer protection. Buyers who skip this step risk paying full price for a device that is close to end-of-life.
- Sellers: No recourse once the device is sold and you have closed the listing.
- Buyers: Data loss if the drive fails unexpectedly after purchase.
- Both: Avoidable conflict that a simple free tool could have prevented.
HDD vs SSD – What You Are Actually Checking
HDDs (hard disk drives) are older mechanical drives that use spinning platters and a read/write arm to access data. SSDs (solid-state drives) use flash memory chips and have no moving parts. Both can fail, but they fail in different ways and show different warning signs.
| Feature | HDD | SSD |
|---|---|---|
| Moving parts | Yes, spinning platters and arm | No |
| Common failure signs | Clicking, grinding noises, slow reads | Silent slowdown, sudden failure |
| Main wear metric | Power-on hours, reallocated sectors | Total bytes written vs rated TBW |
| Load shedding risk | Higher, moving parts are vulnerable | Lower, but power surges still cause damage |
| Health check tool | CrystalDiskInfo (Windows) | CrystalDiskInfo or manufacturer tool |
How HDDs and SSDs Fail Differently
HDDs often give audible warnings before failure, such as clicking or grinding sounds. These are signs the read/write arm or platters are struggling. SSDs, by contrast, tend to fail silently, slowing down gradually before data becomes unreadable without much warning.
For South African sellers who have experienced frequent load shedding, HDDs are particularly at risk. Power cuts during write operations can cause what is called reallocated sectors, where the drive marks damaged areas as unusable and redirects data elsewhere. A rising reallocated sector count is a red flag to disclose.
Free Tools to Check HDD and SSD Health
You do not need to pay for anything to check your drive health. There are solid free options for Windows users, and some choices for Mac users as well.
CrystalDiskInfo (Windows) – Step-by-Step
CrystalDiskInfo is the most widely recommended free tool for Windows. It reads SMART (Self-Monitoring, Analysis, and Reporting Technology) data directly from your drive and gives you an overall health rating. Always download it from the official CrystalDiskInfo site to avoid third-party downloads that may bundle unwanted software.
- Go to crystalmark.info and download the standard or portable version.
- Install and open the application. Your drive/s will appear automatically.
- Look at the top-left panel. The health status will display as Good, Caution, or Bad.
- Note the power-on hours and total bytes written figures.
- Take a screenshot of the results. You will need this for your listing or for disclosure to the buyer.
CrystalDiskInfo supports SATA HDDs, SATA SSDs, and NVMe SSDs. If your NVMe drive does not appear, check the official site for NVMe-specific support notes.
CrystalDiskMark and Other Alternatives Worth Knowing
CrystalDiskMark (from the same developer) tests read and write speeds rather than health status. It is useful for showing a buyer how fast the drive performs, but it does not replace a SMART health check.
- HD Tune (Windows): Offers a benchmark and error scan. A good alternative if CrystalDiskInfo does not detect your drive.
- Samsung Magician: Manufacturer tool for Samsung SSDs. Offers deeper diagnostics and a built-in secure erase function.
- WD Dashboard: Western Digital’s equivalent for their own drives.
- Disk Utility (Mac): Built into macOS. Run First Aid to check for errors. For deeper SMART data on Mac, DriveDx is a commonly recommended paid option.
For a broader comparison of the best hard drive testing tools, Tom’s Hardware provides a well-maintained roundup that covers Windows, Mac, and Linux options.
How to Read Your Results – What Good, Caution, and Bad Actually Mean
The overall health status in CrystalDiskInfo is your starting point, but understanding what sits behind it helps you make better decisions.
Understanding SMART Data Without the Jargon
SMART data is a set of internal counters that your drive tracks automatically. Each counter measures something specific about drive health. How to check hard drive health with CrystalDiskInfo is covered in detail by How-To Geek if you want a deeper walk-through, but here is what the main indicators mean in plain language.
| Status | What it means | What to do |
|---|---|---|
| Good | Drive is healthy, no critical errors detected. | Safe to sell. Include the screenshot in your listing. |
| Caution | One or more SMART attributes are flagged. Drive may still work but shows early wear. | Disclose clearly. Adjust your price accordingly. |
| Bad | Drive has critical errors or is near failure. | Do not sell as functional. Replace the drive or sell the device for parts only, with full disclosure. |
For SSDs, also check the total bytes written figure and compare it against your drive’s rated TBW. The TBW rating is listed in your drive’s datasheet or on the manufacturer’s website. As Crucial explains in their guide on SSD endurance and TBW, exceeding the rated TBW does not guarantee immediate failure, but it does increase risk and should be disclosed.
For HDDs, pay close attention to the reallocated sector count (SMART attribute 5) and pending sector count (attribute 197). Research from Backblaze, who publish real-world hard drive lifespan data from tens of thousands of drives, confirms that these specific attributes correlate strongly with actual drive failure.
What to Do If Your Drive Is Failing or Worn
If your check returns a Caution or Bad status, you have a few honest options. Do not ignore the result and list the device as fully functional.
- Caution status: Lower your asking price to reflect the condition. Include the CrystalDiskInfo screenshot in your listing and state the status clearly.
- Bad status: List the device as spares or for parts only. Buyers who purchase for parts do so knowing the drive is not reliable.
- Replace the drive: A new SSD is relatively affordable. Fitting a new drive can restore the device to full health and justify a higher sale price.
- Sell to a trade-in service: If you would rather avoid the hassle, consider selling your device through Sell Your PC. A professional buyer will assess the drive condition and offer a fair price that reflects it.
Wiping Your Drive Before Selling – A Non-Negotiable Step
A standard delete, quick format, or factory reset does not fully remove your personal data from a drive. Free data recovery tools can retrieve files from improperly wiped drives in minutes. Under POPIA, South African sellers have a responsibility to ensure personal information is properly destroyed before a device changes hands.
The correct approach differs between HDDs and SSDs.
- For SSDs (Windows 10 or 11): Go to Settings, then Recovery, then Reset this PC. Choose "Remove everything" and select "Clean the drive" when prompted. This is effective for most consumer SSDs.
- For SSDs (manufacturer tools): Samsung Magician and Crucial Storage Executive both offer a Secure Erase function for their respective drives.
- For HDDs (Windows): DBAN (Darik’s Boot and Nuke) is a widely used free tool that overwrites the drive multiple times. Note that DBAN is not recommended for SSDs as it can reduce drive lifespan unnecessarily.
- For Mac: Use FileVault encryption first, then erase via Disk Utility. This approach handles both HDDs and SSDs on Apple devices.
For a full walkthrough of how to securely erase an SSD before selling, Lifewire covers each method clearly. Comparitech also has a thorough guide on how to wipe a hard drive before selling, including advice on encryption-based wiping for SSDs.
Common Mistakes to Avoid
- Assuming a factory reset or quick format is a secure wipe. It is not.
- Ignoring a Caution SMART status and listing the device as fully functional.
- Downloading CrystalDiskInfo from a third-party site instead of the official crystalmark.info page.
- Skipping the health check entirely because the device "seems fine". Many drives fail silently.
- Not taking a screenshot of the results before wiping. You need the health report for the buyer.
- Using DBAN on an SSD. It is designed for spinning HDDs only.
If You Are New to This
- Start with CrystalDiskInfo. Download it from the official site, open it, and look at the colour-coded status at the top. Green means Good, yellow means Caution, red means Bad.
- You do not need to understand every SMART attribute. The overall status and the reallocated sector count are your two most important readings.
- Take a screenshot before you do anything else. You will need it as proof of condition for your buyer.
- If you are unsure about what the results mean, our team is available to help before you list your device.
If You Have Done This Before
- Cross-reference your SSD’s total bytes written against the manufacturer’s rated TBW from the official datasheet, not just the CrystalDiskInfo status label.
- Check SMART attributes 5, 187, 197, and 198 individually. Non-zero values on these attributes warrant extra scrutiny even if the overall status shows Good.
- Consider running HD Tune’s error scan in addition to CrystalDiskInfo for a second opinion on older HDDs.
- If your SSD supports it, use the manufacturer’s own tool (Samsung Magician, WD Dashboard) for deeper diagnostics before a high-value sale.
- Browse our Sell Your PC Insights section for more guides on preparing used electronics for sale.
Checklist – Steps to Take Before Handing Over Your PC or Laptop
Seller checklist:
- Run CrystalDiskInfo and note the health status, power-on hours, and total bytes written.
- Take a screenshot of the full results panel.
- Back up all personal data to an external drive or cloud storage.
- Perform a secure wipe using the correct method for your drive type (see above).
- Re-run CrystalDiskInfo after the wipe to confirm the drive is still healthy and data has been cleared.
- Include the pre-wipe health screenshot in your listing or share it with the buyer on request.
Buyer checklist:
- Ask the seller for a CrystalDiskInfo screenshot before agreeing to a price.
- On receipt, run your own health check before finalising payment if possible.
- Confirm the SMART status, power-on hours, and total bytes written match what was disclosed.
Frequently Asked Questions
Is CrystalDiskInfo safe to download and use?
Yes, provided you download it from the official site at crystalmark.info. It is free, open-source, and does not require installation if you use the portable version. Avoid downloading from third-party sites, which sometimes bundle unwanted software.
What does a Caution status actually mean for a used sale?
A Caution status means one or more SMART attributes have crossed a threshold that warrants attention. The drive may continue to work reliably for some time, but the risk is higher than a fully healthy drive. You must disclose this status clearly in your listing and price accordingly. Selling a Caution-status drive as Good condition is misrepresentation.
Do I have to disclose drive health under South African law?
If you sell used electronics as a business or regularly, the South African Consumer Protection Act requires you to disclose known defects. For once-off private sales, the CPA may not apply directly, but honest disclosure protects you from disputes and aligns with the spirit of the law. It is also simply good practice.
Is a Windows factory reset enough to wipe my personal data?
No. A standard factory reset or quick format leaves data recoverable using free tools. For SSDs, use the "Reset this PC – Remove everything – Clean the drive" option in Windows 10 or 11, or use a manufacturer secure erase tool. For HDDs, use DBAN to overwrite the drive. Never use DBAN on an SSD.
Can a health check screenshot help me get a better price for my device?
Yes. A verifiable CrystalDiskInfo screenshot showing a Good health status, low power-on hours, and low total bytes written gives buyers confidence in the condition of your device. In the South African used market, where trust between strangers is a real concern, documented proof of drive health can genuinely justify a higher asking price. You can also get a quote from Sell Your PC if you prefer a straightforward trade-in assessment.
Summary
- A free drive health check with CrystalDiskInfo takes under 10 minutes and protects both sellers and buyers.
- Good status means safe to sell. Caution status must be disclosed and priced accordingly. Bad status means the drive should not be sold as functional.
- SSDs wear through write cycles. Check total bytes written against your drive’s rated TBW figure.
- Always perform a secure wipe before selling. The correct method differs for HDDs and SSDs. Under POPIA, this is not optional.
- If you want professional help assessing or selling your used PC or laptop, visit our professional services page or browse our shop to see what we carry.
This is educational content, not financial advice.
