Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!agate!darkstar!ucscf.UCSC.EDU!isbell From: isbell@ucscf.UCSC.EDU (Art Isbell) Newsgroups: comp.sys.next Subject: Re: hard drive noise levels Summary: Need to standardize mike against known sound level Keywords: disk noise Message-ID: <10161@darkstar.ucsc.edu> Date: 16 Dec 90 21:52:25 GMT References: <1030@nada.cs.utexas.edu> Sender: usenet@darkstar.ucsc.edu Organization: very little -- only me! Lines: 42 Due to different microphone sensitivities, I doubt that John's method will be very informative. What's needed is a standard reference sound level to calibrate against. I would propose the following modifications: In article <1030@nada.cs.utexas.edu> garnett@cs.utexas.edu (John William Garnett) writes: > >0) make sure the recording area is quiet - in particular make sure the >optical disk is not inserted. > 0) make sure the recording area is quiet. 0.1) insert the optical disk containing your original software release. > >1) position the microphone 12 inches (30.5 cm) away from the cube on >a perpendicular from the center of the front of the cube. > >2) on an otherwise idle system, run the following command: > > find -print > > >3) record for approximately five seconds. > 3.1) remove the optical disk. 3.2) on an otherwise idle system, run the following command: find / -print 3.3) record for approximately five seconds. > Because most of us still have optical drives, this modification should tell us how loud the HD is relative to the OD. For those with NeXTStations and/or no OD, I don't know what to recommend as a reference sound level. -- _____ ____ Art Isbell |\ | | | | \ 315 Moon Meadow Lane NeXT Registered Developer | \ | ___ |____| | | Felton, CA isbell@ucscf.UCSC.EDU | \ | |___| | \ | | 95018-9442 (408)438-4736(B) | \| |___ | \ |___/ (408)335-1154(H)