The possibility of a head crash is reduced by keeping the disk clean and at a constant temperature and humidity. Disks are copied at regular intervals so that in the event of a crash a duplicate is available. Fixed disk drives have greatly reduced the probability of a head crash because they are sealed (except for a “breather” filter) and have an internal filter through which the air inside the drive circulates.
"head crash." A Dictionary of Computing. . Encyclopedia.com. (October 15, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/head-crash
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