Signs of a Failing SSD: How to Check If Your SSD Is Failing
Hard drives tend to announce their decline with clicks and grinding. SSDs are quieter about it. The signs of a failing SSD are easy to mistake for a Windows glitch or a bad update, and some SSDs give no warning at all before they disappear. Here’s how to tell if your SSD is failing, how to check its health properly, and what to do while the data is still reachable.
SSD failure symptoms to watch for
Any one of these on its own can have another cause. Two or more together, especially if they’re getting more frequent, should be treated as a failing drive.
- Sudden freezes and crashes. The system locks up for several seconds, then recovers, or blue-screens with storage-related errors. This often happens when the controller is struggling to read data and stalls the whole system while it retries.
- The drive becomes read-only. You can open files but can’t save, install, or delete anything. Many SSDs switch themselves into read-only mode when they run out of healthy spare flash. It’s a protective feature, and it’s your last clear chance to copy everything off.
- Files that won’t open or come back corrupted. Photos that load half gray, documents that report errors, or archives that fail their checksum point to unreadable blocks.
- Bad block or read errors. Messages about I/O errors, cyclic redundancy check errors, or the file system needing repair.
- Very slow performance. An SSD that suddenly copies files at a crawl, or takes minutes to boot, may be spending its time re-reading weak cells.
- Disappearing from the BIOS intermittently. The drive is there on one boot and missing on the next. Intermittent detection usually gets worse, not better.
- Boot failures. “No boot device,” “Inaccessible boot device,” or a boot loop on a system SSD can mean the drive can no longer reliably read its own system files.
If the drive has already stopped showing up at all, skip ahead to SSD not showing up (even in BIOS).
How to check if an SSD is failing
Symptoms tell you something is wrong. Health data tells you whether it’s the drive. Every modern SSD keeps internal health records, and reading them takes a few minutes.
Read the SMART or NVMe health log
SATA SSDs report SMART attributes; NVMe drives report a standardized NVMe health log. The NVMe fields are the easier ones to interpret:
| NVMe field | What it means | When to worry |
|---|---|---|
| Percentage Used | The drive’s own estimate of how much of its rated write endurance has been used | Approaching or over 100% (it can exceed 100%) |
| Available Spare | How much spare flash remains to replace worn-out blocks | Falling, and especially at or below the Available Spare Threshold |
| Media and Data Integrity Errors | Errors the controller could not correct | Anything above zero, particularly if it’s rising |
| Critical Warning | A flag set by the drive when something is wrong | Any value other than zero |
SATA SSDs use vendor-specific attributes, so names vary by brand. Look for wear indicators (often called Wear Leveling Count or Media Wearout Indicator), Reallocated Sector Count, and any uncorrectable error counts. As with hard drives, the trend matters more than a single reading; see Reallocated Sector Count for how to read that one.
Use CrystalDiskInfo or your manufacturer’s tool
- CrystalDiskInfo (Windows, free) reads both SATA and NVMe drives and turns the data into a Good / Caution / Bad status plus a health percentage. Our CrystalDiskInfo guide walks through each field.
- Manufacturer tools read the same data and add firmware updates and diagnostics for their own drives: Samsung Magician, WD Dashboard (Western Digital and SanDisk), and Crucial Storage Executive are the common ones. Most other SSD brands offer a similar utility.
- Built into the OS. Windows 11 shows a basic health readout for NVMe drives under Settings > System > Storage > Advanced storage settings > Disks & volumes > Properties. On a Mac, System Information > NVMExpress (or SATA) shows a SMART status, though it only reports “Verified” or “Failing.”
A drive that reads “Good” can still fail suddenly. SSD controllers can die without any warning in the health data, which is why a clean report is not a substitute for a backup.
Firmware updates: helpful, but image first
Some SSD problems are firmware bugs rather than worn-out flash, and manufacturers have released updates to fix issues such as drives wearing faster than expected or dropping off the system. If your manufacturer’s tool offers a firmware update, it’s worth considering, on a healthy drive.
On a drive that is already showing symptoms, copy or image your data first. A firmware update rewrites the drive’s own operating code. If the drive fails partway through, or the new firmware handles the existing data differently, a drive that was struggling can become one that won’t initialize at all.
What to do if your SSD is failing
- Back up your most important files now. Start with what you can’t replace: photos, documents, project files. Don’t wait to plan a full clone.
- Minimize writes. Close programs that write constantly, pause cloud sync clients that are downloading, and don’t install recovery software onto the failing drive.
- Clone or image if you need everything. Use imaging software that copies readable areas first and skips problem areas rather than retrying endlessly.
- Don’t run “repair” tools on it.
chkdsk /f, file system repairs, and secure-erase or “optimize” functions can make things worse on a drive with failing flash. - If it’s encrypted, find the key. If BitLocker or device encryption is on, locate your recovery key before the drive gets worse. Here’s how to find your BitLocker recovery key.
- Replace the drive. A drive that has shown these signs shouldn’t hold the only copy of anything.
Why SSDs so often fail without warning
Hard drives usually wear out mechanically and gradually. Many SSD failures are electronic: a controller, power component, or firmware fault that takes the whole drive offline at once. Flash wear is predictable and shows up in the health data; a controller failure often doesn’t. For typical lifespans and what affects them, see how long SSDs and hard drives last.
That’s why the most reliable defense isn’t monitoring. It’s having a second and third copy of your data, as described in the 3-2-1 backup rule.
The bottom line
The signs of a failing SSD are freezes, read-only behavior, corrupted files, slowdowns, and a drive that comes and goes. Check the NVMe health log or SMART data with CrystalDiskInfo or your manufacturer’s tool, watch Available Spare and Media and Data Integrity Errors, and back up before you update firmware or replace anything.
If the drive has already gone read-only, stopped booting, or vanished, our SSD recovery service handles controller, firmware, and flash failures for one flat $1,200 price per device, with free prepaid shipping, and you pay nothing unless we recover your data.