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. 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).

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