When it comes to the average lifespan of a hard drive on a Mac, there is no definitive answer. However, it is generally accepted that it will last an average of four to five years under ideal conditions. This can vary depending on the configuration and use of the Mac Pro, as these are typically used by advanced users. The more the user depends on speed and performance for high-end use, the faster they may need to replace it.
Every three or four years is a more realistic lifespan for a production computer. The lifespan of a hard drive is not absolute, and it can vary depending on how it is used. In theory, HDDs will last three to five years, while an SSD would work for up to ten years. However, these figures are dependent on the quality of construction, periods of use and operating conditions of the units.