That shows the actual wear out of the drive. Percentage Used field, which is like a gas gauge for the endurance The easy way to monitor endurance of an NVMe SSD is the SMART Try running the Crucial Storage Executive tool to get a more accurate SMART reading that (should) follow Crucial's definitions by the book.įrom my laptop Percentage Used: 6% which means 94% is remaining (estimate) from the spec These attributes are not a full picture of the health of a drive, but an expectation of how much usable life is left.īecause the attribute is vendor-defined, it can be complicated and confusing to figure out how each drive implements it. For percent lifetime remaining we would simply take (3000-100)/3000 = 96-97%. For example if your drive is rated for 3000 block erases and you have a total of 100, your Percentage Lifetime Used would be 100/3000, or 3-4%. Your Crucial SSD will keep track of this life with SMART attribute 173, “Average Block Erase Count.” The Lifetime Used is a reflection of the block erase count in terms of a percentage. A solid state drive, like any flash memory-based storage device, has a limited amount of data which can be written to the memory blocks before they start to lose their reliability, and eventually go into read only mode. In regards to the attribute named “Percentage Lifetime Used” (sometimes referred to as “Percent Lifetime Remaining”), this is simply a metric for how much wear life is left on your SSD. After some additional research, I came across this article that mentions the following:
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