How to Check SSD Health: S.M.A.R.T., TBW and Real Lifespan
Which Value Matters, and When to Worry
Short answer: open PowerShell and run Get-PhysicalDisk | Select FriendlyName, HealthStatus, MediaType — a healthy drive reports Healthy. For detail, Get-PhysicalDisk | Get-StorageReliabilityCounter reports wear, temperature and total bytes written. On NVMe SSDs the attribute that matters most is "Percentage Used"; on SATA SSDs it is "Wear Leveling Count" together with "Reallocated Sector Count".
SSDs do not die with the clicking noises of a failing hard drive; they wear down quietly and usually end by dropping into read-only mode. The good news is that a modern SSD's endurance rating is far beyond what an average user will reach in years of normal use. This guide covers how to measure your drive's real condition with tools Windows already includes, what each number actually means, and which symptoms mean you should back up immediately.
In sintesi
- Get-PhysicalDisk in PowerShell reports Healthy, Warning or Unhealthy for every drive in the system.
- On NVMe SSDs the most meaningful indicator is "Percentage Used": 100% means the rated endurance budget is spent, not that the drive is about to die.
- A typical 1 TB consumer SSD is rated for 300-600 TBW; a user writing 30 GB a day would take well over a decade to reach that.
- Verify TRIM with fsutil behavior query DisableDeleteNotify — a result of 0 means TRIM is enabled.
- Never defragment an SSD; Windows' Optimize Drives tool runs TRIM rather than defragmentation on solid state media.
- If the drive goes read-only, files start disappearing, or it vanishes from the BIOS, back up immediately — those mark the point of no return.
What Is S.M.A.R.T. and Which Attributes Matter?
S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is the standard by which drives monitor and report on their own condition. It produces dozens of values, but they are not equally meaningful; for SSDs, only a handful actually matter.
On NVMe SSDs the key indicator is "Percentage Used". It expresses how much of the manufacturer's rated endurance budget has been consumed, so a value of 10% means one tenth of the drive's rated life is gone. "Available Spare" tells you how much of the reserve capacity set aside to replace failed cells remains; take it seriously if it drops below 10%.
On SATA SSDs the equivalents are "Wear Leveling Count" and, on some manufacturers, a direct "SSD Life Left" reading. On either type, a "Reallocated Sector Count" or "Media and Data Integrity Errors" value that is above zero and climbing over time is the clearest sign that the drive is physically degrading.
TBW: How Long Will Your SSD Actually Last?
TBW (Terabytes Written) is the total write volume the manufacturer warrants and the standard measure of SSD endurance. Typical consumer drives are rated at 150-300 TB for 500 GB models and 300-600 TB for 1 TB models. Endurance rises with capacity because writes are spread across more cells.
Translating that figure into daily life reassures most users. An average user writes 10-30 GB per day, which works out to roughly 4-11 TB per year. On a drive rated for 300 TB that means a service life comfortably beyond a decade. In practice most SSDs are replaced for being outdated long before they approach their endurance limit.
There are exceptions: systems that continuously edit video, work with large datasets or run virtual machines can write hundreds of gigabytes per day. If that describes your workload, checking the total bytes written in Get-StorageReliabilityCounter once a year is worth the minute it takes.
Why TRIM Matters and How to Check It
An SSD cannot overwrite data in place; it has to erase the block first. The TRIM command lets the operating system tell the drive which blocks belong to deleted files so it can clear them ahead of time during idle periods. Without TRIM, every write eventually requires an erase first and performance degrades noticeably over time.
TRIM has been enabled by default since Windows 7, but it can end up disabled on some installations. To check, run fsutil behavior query DisableDeleteNotify in a command prompt. A returned value of 0 means TRIM is active; if it returns 1, enable it with fsutil behavior set DisableDeleteNotify 0.
TRIM also depends on free space: a permanently full drive leaves nothing to pre-clear. That is why keeping at least 15-20% of an SSD free is not merely a suggestion but a requirement for the drive to behave as designed. Disk Mop's Disk Health module reports TRIM status alongside S.M.A.R.T. attributes on a single screen.
Warning Signs of SSD Failure
SSDs give no audible warning the way hard drives do, so the symptoms appear on the software side. The most common first sign is file copy speed dropping permanently and large saves taking noticeably longer.
At a more serious stage, files begin to corrupt: documents that will not open, game installs that fail verification, recurring blue screens. Some drives put themselves into read-only mode at the critical point — you can read existing data but write nothing. That is a deliberate last line of defence by the manufacturer, and it means back up now.
The bluntest symptom is the drive not appearing in the BIOS or in Disk Management at all. At that stage, data recovery usually requires a professional service with no guaranteed outcome. This is exactly why backing up the moment S.M.A.R.T. reports Warning is the only reliable way to avoid loss.
What to Do and What to Avoid for a Longer Life
The single most important thing to avoid is defragmentation. Defragmenting performs a large number of writes to physically rearrange data; it helps on hard drives and does nothing but cause needless wear on an SSD. Windows already knows this: when "Defragment and Optimize Drives" detects an SSD, it runs TRIM instead. Do not point old third-party defragmenters at solid state drives.
The things you should do are simpler: leave enough free space (15-20%), make sure TRIM is enabled, keep firmware current using the manufacturer's utility, and protect the drive from extreme temperatures. NVMe SSDs run hot under sustained load and throttle above about 70°C; you can watch this via the Temperature value in Get-StorageReliabilityCounter.
Reducing pointless writes helps too. Ever-growing caches, redundant temporary files and background sync clients all generate writes quietly. Disk Mop's Disk Health module reports drive status and TRIM, while Cache Cleaner and scheduled cleanup keep that accumulation in check. You can download Disk Mop free and try it with limited features; the Pro version is a one-time $19.90 payment for a lifetime license. It runs on Windows 10 and 11 (64-bit) and macOS 12 or later.
Domande frequenti
How do I check SSD health on Windows without installing anything?
Open PowerShell as administrator and run Get-PhysicalDisk | Select FriendlyName, MediaType, HealthStatus; healthy drives report Healthy. For more detail, Get-PhysicalDisk | Get-StorageReliabilityCounter reports wear percentage, temperature, read and write error counts and total power-on hours.
How long does an SSD last?
Typical consumer drives are rated at 150-300 TBW for 500 GB models and 300-600 TBW for 1 TB models. An average user writing 10-30 GB per day writes 4-11 TB per year, meaning it would take over a decade to reach that limit. Most SSDs are replaced for age or capacity long before endurance becomes an issue.
Does the SSD die when "Percentage Used" reaches 100%?
No. That value indicates the manufacturer's rated endurance budget has been fully consumed, not that the drive stops working. SSDs past 100% frequently keep running for years. What does change is that warranty coverage ends and regular backups become considerably more important.
How do I know whether TRIM is enabled?
Run fsutil behavior query DisableDeleteNotify in a command prompt. If DisableDeleteNotify returns 0, TRIM is enabled. If it returns 1, enable it with fsutil behavior set DisableDeleteNotify 0. For TRIM to work efficiently, the drive should also have 15-20% free space available.
Should I defragment an SSD?
No. Defragmentation generates a large volume of unnecessary writes and wears the drive for no benefit, since access time on an SSD does not depend on physical location. Windows' Defragment and Optimize Drives tool already detects solid state drives and runs TRIM instead of defragmenting them.
How do I know if my SSD is failing?
The first sign is usually a permanent drop in write speed. Next come file corruption, documents that will not open and recurring blue screens. The drive switching to read-only mode, or disappearing from the BIOS entirely, is the final stage. Back up the moment S.M.A.R.T. reports Warning, without waiting for further symptoms.
Verdetto
You do not need third-party software to check SSD health: Get-PhysicalDisk in PowerShell gives the overall status and Get-StorageReliabilityCounter gives wear, temperature and error counters. On NVMe watch "Percentage Used"; on SATA watch "Wear Leveling Count".
The numbers are reassuring for most users: a modern SSD rated at 300-600 TBW has a service life well beyond a decade under normal use. What deserves your attention is not gradual wear but sudden failure signs — read-only mode, disappearing files and S.M.A.R.T. warnings.
Extending the life of an SSD comes down to a short list: keep 15-20% free, leave TRIM enabled, never defragment it, and clear the accumulated caches that generate needless writes.
See Your Drive's Real Condition
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