![]() Troubleshooting tips if you installed the SAT SMART Driver (special driver to allow your Mac to receive S.M.A.R.T. The more measurement history DriveDx has – the more precise its results. For such health indicators, DriveDx uses heuristics based on measurement history for the detection of a possible range of min/max values. This is especially could be important in case if the drive has some undocumented proprietary (vendor-specific) health indicators (S.M.A.R.T. The more measurement data (history) DriveDx has, the more accurate the results. The last one (measurements history) also could be a cause of different results on multiple computers for the same drive. health indicators (SMART attributes) proximity to threshold.SMART attributes statistically closely related to HDD or SSD failures.For example, some Intel SSDs could report some strange results when its firmware performs garbage collection routines.ġ) Some subset of HDD / SSD health indicators is related not only with HDD / SSD itself but also with hardware environment (computer, ports, cables, power supply, drive and ambient temperature and (sometimes even) electrical noise).Ģ) DriveDx evaluates drive health status based on the next criteria: SSD results could be affected by internal firmware activities related to garbage collection and self-recovery routines. High temperatures could trigger thermal throttling and affect the performance of SSDs. some other vendor-specific health indicators.Temperature, vibration level or electrical noise conditions could affect the following health indicators (SMART attributes): ![]() Quality of data cables affects health indicator #199 “(UDMA) CRC Error Count”. Fluctuation of “Spin-Up Time” indicator usually means that drive have not enough power supply or has not optimal temperature conditions or both. However, most modern computers have the ability to stop a drive while the machine is already running as a means of energy conservation or noise reduction. Spin-up generally occurs at the very beginning of the computer boot process. Health indicator “Spin-Up Time” reports average time (in milliseconds or seconds) of spindle spin-up (from 0 rpm to fully operational). In the case of HDDs: #3 “Spin-Up Time” is mostly affected by power supply health indicator. SSDs and especially HDDs could be sensitive to power supply level, and high performance 7200+ RPM HDDs could be very sensitive to power supply level. In addition to how much data has been written to the disk, this gives access to more than a dozen other parameters.Some subset of HDD / SSD health indicators is related not only with HDD / SSD itself but also with hardware environment (computer, ports, cables, power supply, drive and ambient temperature and (sometimes even) electrical noise). Typically, a 250GB SSD will have a rating of 60 and 150TBW, which means that even at the lowest end of the rating to exceed this number in a year, you’d have to be writing more than 100GB of data onto that 250GB drive EVERY DAY.Ī tool I use for keeping an eye on my storage drive is DriveDX. ![]() It’s a feel-good number that storage manufacturers come up with to measure storage life (think MTTB or Mean Time Before Failure for hard drives). One key metric of SSD wear is measured in TBW, or TeraBytes Written. So, in addition to having a backup or two (you should always have at least two backups of your important data), it’s a good idea to keep an eye on your Mac’s storage drive. The downsides of SSDs compared to HDDs is that you get little to no warning when they are starting to malfunction, and when they die, it’s generally permanent. SSDs (Solid State Drives) are much more reliable than HDDs (Hard Disk Drives), but that doesn’t make them invulnerable.
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