Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!samsung!uunet!sjsca4!poffen
From: poffen@sj.ate.slb.com (Russ Poffenberger)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: SCSI IDE hard drive
Keywords: SCSI, IDE
Message-ID: <1990Dec18.221736.2173@sj.ate.slb.com>
Date: 18 Dec 90 22:17:36 GMT
References: <1776@fornax.UUCP> <2596@sixhub.UUCP>
Reply-To: poffen@sj.ate.slb.com (Russ Poffenberger)
Distribution: na
Organization: Schlumberger Technologies, San Jose, CA.
Lines: 34

In article <2596@sixhub.UUCP> davidsen@sixhub.UUCP (bill davidsen) writes:
>In article <1776@fornax.UUCP> liu@fornax.UUCP (Lixin Liu) writes:
>| 
>| Hi, could someone tell me what a SCSI IDE drive is?  I saw some ads of 
>| local computer stores, they sell some brand of hard drive which is SCSI IDE.
>| I don't understand what exactly this type of drive does. The saleman could
>| not clearly explain this. 
>
>  I would assume at first hand that your salesman is confused. Disks can
>come in MFM, RLL, ESDI, SCSI, or IDE interface to the computer, but each
>is diferent and requires a diferent controller.
>
>  If he can't explain that, I suspect he can't understand it, and would
>look elsewhere. He may mean a SCSI interface 3-1/2" disk, he may mean
>SCSI on the drive between the drive and integrated controller, or he
>may have picked some good buzzwords, like "standard metric
>hexadecimal."
>
>  When someone says something which sounds very unlike what the rest of
>the world says, and can't explain it, I assume he's incompetent.
>
>  Unless he's a salescritter, then I assume he's lying.

Actually MFM and RLL are recording technologies, not interface standards. What
the basic IBM AT interface uses is ST-506.

ESDI, SCSI, and IDE are interface standards, they typically use either MFM or
RLL as the recodring technology on the disk itself. IDE is just a derivative
of ST-506, with the controller built into the drive.

Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
Schlumberger Technologies       UUCP:   {uunet,decwrl,amdahl}!sjsca4!poffen
1601 Technology Drive		CIS:	72401,276
San Jose, Ca. 95110             (408)437-5254