Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!unido!pbinfo!ill From: ill@uni-paderborn.de (Markus Illenseer) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: IDE/MFM drive and controller coexistence Message-ID: <1990Sep27.211233.2202@uni-paderborn.de> Date: 27 Sep 90 21:12:33 GMT References: <603@secola.Columbia.NCR.COM> <1990Sep24.190445.3643@uni-paderborn.de> <965@gvlv2.GVL.Unisys.COM> Organization: Uni-GH Paderborn, West Germany Lines: 33 kleonard@gvlv1.gvl.unisys.com (Ken Leonard) writes: >In article <1990Sep24.190445.3643@uni-paderborn.de> ill@uni-paderborn.de (Markus Illenseer) writes: >* [deleted] >* master drive. (All IDE drives can be jumpered as master and as slave drive.) >------- >What do the terms "master" and "slave" mean for IDE? >------------ >regardz, >Ken Hi Ken! Yo! This is an interessting thing! Allmost all IDE-Drives have jumpers on to jumper them as master and slave. Master is the drive on wich the controller is working. The slave drive is this one which controller is dis- abled. In other words: IDE drives have their controller already included (embedded). So if you connect two drives, you only need one controller. With these jumpers, you can enable or disable the controller. If you connect two drives you have to look wich controller you like to enable. Sometimes you must enable the slowest controller, because the seek-time can not be increased just because you use a new controller. The Master-Slave ratio is something like (in easy way) the ID's on normal MFM or RLL Drives. (ID 0 for first, ID 1 for second drive). You have to jumper the drives, because you can't run both controllers at the same time (say with another, second IDE-Hostadaptor). In AT with Setup, you sometimes have problems with user-defined types. Check out first, when you buy new drive. Hope this help you, and others ! CU, Markus ******************************************************************************** Markus Illenseer I'm sorry Dave, I'm afraid, I can't do that. 4790 Paderborn ,United Germany Email: ill@uni-paderborn.de ********************************************************************************