You might be able to tell from this description that the SSD can be expected to work quite well as the lifetime counter counts down from 100 percent. This should give most computer users plenty of time to retrieve any data from an unused drive after some time on the shelf, if needed. Micron is a leading member of JEDEC, which defines data retention in a specific way: For SSDs in client applications (like business or personal computers), data retention for an SSD shall be one year, in an unpowered state, stored at 30 ☌ (86 ☏). The Joint Electron Device Engineering Council (JEDEC) is the industry group which creates standards and specifications for semiconductor-based devices and assemblies. However, almost like human memory, it gets shorter as it experiences wear and tear, by writing data (data reads do not directly cause wear). 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 use the projected lifetime – it does not mean that the drive is going to fail when that counter reaches zero, only that your SSD may need to be replaced soon. When the SSD is brand new, Attribute 202 will report “100”, and when its specified lifetime has been reached, it will show “0,” reporting that 0 percent of the lifetime remains. It is a measure of how much of the drive’s projected lifetime is remaining at any point in time. This attribute is exactly as its name implies. We’ll talk about some of the more important ones here, when the attribute is named differently for SATA and PCle, both names will be presented:Īttribute 202: Percentage Lifetime Remaining (Percentage Lifetime Used on PCIe) Some attributes report critical information about the SSD, while others are informational only. Storage Executive will always be programmed with the correct attribute descriptions and thresholds (when applicable) for all but the oldest legacy Crucial SSDs.Ĭrucial SSDs record several different attributes for retrieval by Storage Executive. ![]() We have seen examples where the “Power-on Hours Count” attribute reports a number to the utility, and the incompatible utility may incorrectly label that number “Program Fail Count” or “Reported Uncorrectable Errors.” Worse, the third-party utility may have failure thresholds which are inappropriate for the SSD in question, so the SMART utility reports a failure at a point the manufacturer knows to be acceptable operation.īecause of this potential confusion, Crucial recommends using only our Storage Executive software as a tool to accurately retrieve and analyze SMART data on Crucial SSDs. However, unless the third-party software vendor consults with the drive vendor on correct SMART attributes, their definitions and thresholds (when applicable) are likely to mislabel the attributes and can lead to false-positive or false-negative failure reports. ![]() ![]() There are several third-party utilities that can retrieve and report a drive’s SMART data, often available in freeware and shareware. The attribute descriptors will vary between SSD and HDD, and even between the various SSD vendors. Unfortunately, regardless of the storage technology, there is no industry-wide standard to tell you which numbered SMART attribute describes a specific physical property of a drive. SMART was originally implemented on HDDs and was adapted for SSDs when this new technology was invented as a drop-in replacement for spinning hard drives. SMART has been around for many years and predates the birth of the SSD. The drive can only report if certain attributes have passed over pre-determined thresholds, and then only if thresholds have been programmed in firmware. SMART data can be a valuable tool, providing an early warning if a drive is having problems or has reached the end of its useful life, leading to the possibility of replacement before a failure.Įasy reporting to a user or system administrator is important because the drive itself is not capable of an in-depth analysis of the data. As the name suggests, it is a tool that records the health data of a hard drive disk (HDD) or a solid state drive (SSD). SMART stands for Self-Monitoring, Analysis and Reporting Technology.
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