The robustness of the drive hardware was tested by the 7.1 1989 Loma Prieta earthquake . The HP campus in Cupertino had 1,682 HP 7935 drives operating at the time of the quake and 97.25 percent were still operational afterwards . Within an hour , only 2 percent were non-operational and only 1.5 percent were non-operational several days later
1989 Loma Prieta earthquake
1989 Loma Prieta earthquake
HP 7935