On the cusp of the much-awaited transition from spinning drives to SSDs, we were told that the latter did not have moving parts. SSDs were not only much faster, but also immune to mechanical failure. Unlike the 5-year lifespan of hard drives, SSDs boast double that, often more. However, the SSD running inside your PC right now isn't guaranteed to last for years and years. It might not fail due to mechanical issues, but even flash storage has a limited lifespan. Once you have written enough data onto your SSD, it becomes a read-only drive. You should start arranging a replacement much before this actually happens. Your operating system doesn't make this readily apparent, though. Keeping an occasional eye on your SSD's health is your responsibility, and it's about much more than just the percentage of lifespan remaining.

Your SSD keeps score behind the scenes

Nothing lasts forever

Every time your OS wants to write data onto your SSD, the onboard controller needs to find an empty cell. The way SSDs operate, they can't write to a partially filled cell, which is why your drive needs to move data out of one if it needs to fill new data in it. On a new drive, this isn't a big issue since the entire drive consists of empty cells. Over time, however, as the drive fills up, the constant erase/write operations physically degrade the NAND flash. These program/erase (P/E) cycles are hence finite, and can only last till the SSD has enough cells left that haven't been completely degraded. SSDs use a variety of techniques to delay the inevitable, such as wear leveling and over-provisioning. The former spreads out the write operations evenly across the cells to avoid depleting a particular block of cells prematurely. The latter designates a section of the NAND cells to be used to replace cells when they're fully degraded.

Once you've written enough data onto your SSD, and the threshold of P/E cycles has been reached, the SSD enters a read-only state. It can still access your data, but can't write new information. The lifespan of an SSD is commonly denoted in terms of terabytes written (TBW). It depends on the capacity of the drive, and most 1TB consumer SSDs have a 600 TBW rating. Your SSD keeps track of the amount of data written, reallocated sector count, error count, available spare blocks, wear leveling count, and so on. This S.M.A.R.T (Self-Monitoring, Analysis, and Reporting Technology) data is readily viewable with the right tool, and readily highlights your SSD's health. However, the built-in Windows settings do a poor job of keeping you informed.

Windows doesn't show you most of the S.M.A.R.T data

Your SSD might be suffering under the surface

Yes, I know that the storage settings on Windows 11 show the remaining lifespan as well as the available spare space (buffer cells) of your SSD. Still, this information is buried 3–4 clicks deep in the storage settings. Windows will also display a warning on this screen if it thinks your SSD has a severe problem. The bigger issue, however, is that besides the two metrics above, you won't see any other information about your drive. The remaining lifespan is a useful metric, but it doesn't tell you the whole picture. Many SSDs with a healthy percentage of lifespan remaining can have other underlying issues that can creep up on you. For instance, a high reallocated sector count tells you that the SSD has been replacing dying cells for a while, indicating impending failure. Similarly, a non-zero value in the "Critical Warning" field signals a serious issue with the SSD, and demands urgent attention.

Signs like slowed transfers, longer access times, or file corruption won't pop up in day-to-day usage. Only when you seriously push your SSD will you notice something wrong, but it might be too late by then. Since Windows does not make it easy to see all the S.M.A.R.T metrics of your SSD, you should rely on third-party alternatives. Programs like CrystalDiskInfo provide a detailed look into SSD health by displaying Total Host Writes, Available Spare, Critical Warning, Percentage Used, and many more metrics. The singular Health Status is also displayed at the top for each of your drives, which is the same Estimated remaining life shown in the Windows settings. You don't need to check your SSD health regularly, but doing so twice or thrice a year is recommended. If you're noticing problems with your drive, it is mandatory to have a quick look at CrystalDiskInfo. If you notice a sudden change in any of the important metrics, it might be time to run some tests on your drive.

Extending your SSD's lifespan is on you

Do your bit to give your drive the best chance

Keeping track of your SSD's health twice or thrice a year is well and good, but you also need to prevent it from biting the dust prematurely. Writing too much data to your SSD isn't the only threat; overheating and power surges can kill it way before you ever reach the TBW rating. Don't treat your consumer drive like an enterprise one — virtual machines, containers, and databases running 24/7 should be out of the question. Don't use your main SSD as a scratch disk either; a small but dedicated scratch disk is the right call. You should also disable hibernation if you don't use it, reduce the pagefile size, and turn indexing off for some folders to reduce background write activity. While you're at it, don't fill your SSD to the brim — leaving little free space leads to write amplification, needlessly degrading the flash cells.

As for overheating, keep your PC dust-free by cleaning your tower every 3–4 months. If your SSD runs particularly hot, slap on a heatsink to keep the temperature under control. Heat doesn't play well with your SSD's internals; it can cause unnecessary wear on the components. Electrical failure can also occur in the absence of proper surge protection. Use a surge protector or a UPS with built-in surge protection to minimize the risk of component failure due to a power surge.

Don't assume that your SSD will last forever

The average user will most likely never write enough data to their SSD to deplete its lifespan. That said, hammering your drive with enterprise-grade workloads, ignoring overheating, and skipping surge protection can still kill your SSD before its time. You shouldn't worry about reaching the TBW rating of your drive, but rather about putting undue stress on its internals.