Seagate ST930818SM, ST980818AM, ST980817SM manual Acoustic mode, Idle, Seeks, bels typ, bels max

(Number of seeks per second = 0.4 / (average latency + average access time)

Acoustic mode

Idle*	Seeks
1.7 bels (typ)	1.9 bels (typ)
1.9 bels (max)	2.1 bels (max)

*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.

EE25.2 Series Product Manual, Rev. E 21