Of all the parts in a used laptop, the SSD is the one that hides its condition best. A dying battery announces itself. A worn keyboard is visible. But an SSD at 30% health boots Windows just fine today — and takes all your notes with it when it dies three months later. This is the check I run on every single machine that comes to us, and it takes five minutes.
Step 1: Install CrystalDiskInfo
CrystalDiskInfo is free, tiny, and the industry-standard tool for this. Download it from the official site (crystalmark.info), install, and open it. If you're testing at a shop, carry it on a pen drive — the portable version needs no installation. An honest seller will have no problem with you running it.
Step 2: Read the three numbers that matter
Health Status is the summary verdict. "Good" in blue means the drive's internal monitoring (called SMART data) shows no serious wear. "Caution" usually means some memory cells have failed or spare blocks are being used up. It might run another year, or another week — nobody can promise which.
The percentage is the remaining rated life. SSDs wear out by writing — every memory cell can only be written a limited number of times. A drive at 95% barely lived; a drive at 65% spent years in heavy use, and you should assume replacement cost (₹1,500–2,500 for 256GB) in your negotiation.
Power-on hours tells you the machine's life story. I've seen "barely used, madam ka laptop" machines showing 26,000 hours — that's three years of running 24 hours a day. The seller's story and the SMART data don't always match. Trust the data.
Step 3: A quick speed sanity check
Health can be fine while speed is not — some sellers put the cheapest possible SSD into an old machine before selling. Run CrystalDiskMark (same developer, also free) once:
- SATA SSD: expect roughly 400–550 MB/s read. Fine for study use.
- NVMe SSD: expect 1,500 MB/s or higher. If an "NVMe" drive shows 400 MB/s, something is wrong.
- Under 200 MB/s read: either a dying drive or an HDD pretending. Investigate before paying.
When to walk away vs when to negotiate
A weak SSD is not automatically a deal-breaker — it's a negotiation card. Drives are cheap and easy to replace. If everything else about the laptop is excellent and the SSD shows 70% health, ask for ₹1,500–2,000 off and swap the drive yourself (or have any shop do it for ₹200 labour).
Walk away without negotiating when: health status is "Bad", the seller refuses to let you run the tool, or the SMART data contradicts the seller's story so badly that you can't trust anything else they've said. In a market with hundred other sellers, trust is the spec that matters most.
Five minutes with a free tool protects months of your study notes. No used laptop purchase should skip it.
