Logically: a % measurement should never exceed 100. In practice, <https://forums.freebsd.org/posts/361741> for example: > dT: 1.002s w: 1.000s > L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name > 0 0 0 0 0.0 0 0 0.0 0.0| cd0 > 76 1 0 0 0.0 1 32 11988 432.5| ada0 > 0 0 0 0 0.0 0 0 0.0 0.0| ada0p1 > 76 1 0 0 0.0 1 32 11988 432.5| ada0p2 > 0 0 0 0 0.0 0 0 0.0 0.0| ada0p3 > 0 0 0 0 0.0 0 0 0.0 0.0| gptid/490ad9ec-fab0-11e6-a987-ed324707a782 The manual page <https://www.freebsd.org/cgi/man.cgi?query=gstat&sektion=8&manpath=FreeBSD> does not explain the excesses.