Return to BSD News archive
Received: by minnie.vk1xwt.ampr.org with NNTP id AA76 ; Thu, 28 Jan 93 04:02:03 EST Newsgroups: comp.unix.bsd Path: sserve!manuel.anu.edu.au!munnari.oz.au!spool.mu.edu!uwm.edu!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!newsserver.jvnc.net!newsserver.technet.sg!ntuix!eoahmad From: eoahmad@ntuix.ntu.ac.sg (Othman Ahmad) Subject: Re: [386BSD] Creative Labs CD-ROM drivers - Any progress? Message-ID: <1993Jan27.014525.20705@ntuix.ntu.ac.sg> Organization: Nanyang Technological University - Singapore X-Newsreader: TIN [version 1.1 PL8] References: <1k4ei3INN6kl@mudos.ann-arbor.mi.us> Date: Wed, 27 Jan 1993 01:45:25 GMT Lines: 35 Marc Unangst (mju@mudos.ann-arbor.mi.us) wrote: : In article <1993Jan26.073432.16561@ntuix.ntu.ac.sg> eoahmad@ntuix.ntu.ac.sg (Othman Ahmad) writes: : >Why do say we are stupid when the ATBus version is surely faster than the : >SCSI version? : However, I doubt there's going to be any noticable performance : difference at all. Keep in mind that with a CD-ROM drive, the : bottleneck is getting the data off the CD, not getting the data from : the CD-ROM drive to the host. The CD<->drive transfer rate is going : to be 150K/s (or 300K/s, if you have one of the fancy double-speed My figures are actually from CD disk drives called lasermate which I was led to believe is a panasonic. It comes with 2 versions, the ATBUS(16-bit), and SCSI(S$80 more expensive). Reading the specs, I notice that the transfer rate for the SCSI is about 30%, 150K/s vs 170K/s(?). The access time of the SCSI is 0.5s vs 0.38 for the ATBUS version. The drives look similar so must be identical mechanically so the SCSI must have incurred a lot of overhead. Remember that the ATBUS is not IDE, so virtually the PC has full access to the internals of the CDROM circuit board. : drives), no matter what you do with the host adapter; 150K/s is much : lower than the maximum transfer rate of even an 8-bit card using : programmed I/O. YOu got the point. In fact I posted these observations to alt.cd-rom but no response. I believe people do not read the specs and compare. -- Othman bin Ahmad, School of EEE, Nanyang Technological University, Singapore 2263. Internet Email: eoahmad@ntuix.ntu.ac.sg Bitnet Email: eoahmad@ntuvax.bitnet