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From: davidsen@sixhub.UUCP (Wm E. Davidsen Jr)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: SCSI IDE hard drive
Keywords: SCSI, IDE
Message-ID: <2690@sixhub.UUCP>
Date: 19 Dec 90 23:55:04 GMT
References: <1776@fornax.UUCP> <2596@sixhub.UUCP> <1990Dec18.221736.2173@sj.ate.slb.com>
Reply-To: davidsen@sixhub.UUCP (bill davidsen)
Distribution: na
Organization: *IX Public Access UNIX, Schenectady NY
Lines: 25

In article <1990Dec18.221736.2173@sj.ate.slb.com> poffen@sj.ate.slb.com (Russ Poffenberger) writes:

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

  And if you want to be that pickey MFM is actually a low grade version
of RLL (1,3 if my memory serves).

| 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.

  The point I was making is that if the salesman didn't understand what
he was saying well enough to clarify the point I wouldn't believe him.
There can be such a thing as SCSI IDE (per earlier post) if you talk
about the drive to controller and controller to adaptor interface
separately, but I would want to be very sure what I was getting.

  It's like ads for "AT drives." Some mean IDE and some mean for use in
an AT (MFM), and I don't want to buy one to find out.
-- 
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
    sysop *IX BBS and Public Access UNIX
    moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me