When an SSD or other NAND-flash device is brand new, its unpowered data retention will be several years. Data retention is the amount of time that the device can safely store and allow successful retrieval of user data in an unpowered state. The lifetime of a NAND-flash device is defined by another characteristic: data retention. However, it's important to realize what it means to reach 100 percent of projected lifetime – it does not mean that the drive is going to fail when that counter rolls over to 101 percent, only that your SSD may need to be replaced soon. When the SSD is brand new, Attribute in SMART info Summary will show when its specified lifetime has been reached, it will show “0,” reporting that 100 percent of the lifetime has been used. It is a measure of how much of the drive's projected lifetime has been used at any point in time.
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