This read-only Integer32, constrained to 0-100, reports the 5-minute average load of the disk as a percentage. Admins use it as a medium-term trend indicator to distinguish a genuinely busy disk from short-lived traffic bursts already captured by the 1-minute average. For example, a rising 5-minute average alongside a similarly elevated 1-minute average would tell an admin the disk load is sustained, not just a momentary spike.