![]() ![]() This is similar to MTBF and differs only in the way it measures units: AFR is the probable percentage of failures per year based on the manufacturer's total number of installed units of a similar type, whereas MTBF measures the probable average number of service hours between failures. Since it considers MTBF “not representative”, Seagate has moved to a new standard, AFR. WD puts the MTBF of its drives at over a million. Originally developed for the military, MTBF is expressed in power-on hours (p.oh.) and is often a specification associated with hard drive mechanisms. The load/unload cycle count is used by Western Digital (WD), suggesting its range of 500GB to 6TB 7200 RPM Class 3.5-inch hard drives will last for as many as 300,000 controlled unloads under ordinary conditions.įrom Seagate's perspective, MTBF is archaic and it no longer uses this statistical term related to data integrity. Standards Expressing a Hard Drive's Lifespanīefore purchasing a hard drive it’s important to take into consideration several factors besides its size that influence the integrity of any data that will be installed, such as the drive’s load/unload cycles, MTBF (mean time between failures), or AFR (Annualized Failure Rate). That is, of course, under ideal conditions. ![]() ![]() As for the average lifespan of an HDD in a Mac, there is no clear consensus but it’s a pretty safe bet to assume that it will last on average somewhere between four and five years. ![]() In fact, it’s easy to fall into the trap of believing the myth that different HDD lifespans are related to specific operating systems, but the reality is that the length of a drive’s life depends on many factors, starting with the brand through to the capacity and interface used. Sadly, it's not a question of if but when your Mac’s hard drive or SSD will stop working, and essentially it doesn't matter which operating system you are using. ![]()
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