Date: Fri, 11 Aug 2000 04:53:01 -0400 From: "Gary T. Corcoran" <garycor@home.com> To: Francisco Reyes <fran@reyes.somos.net> Cc: FreeBSD Hardware List <freebsd-hardware@FreeBSD.ORG>, Michael VanLoon <MichaelV@EDIFECS.COM> Subject: Re: Best behaved drives for FreeBSD? Message-ID: <3993BEED.B80644A@home.com> References: <200008110751.DAA11086@sanson.reyes.somos.net>
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Francisco Reyes wrote: > > On Fri, 11 Aug 2000 03:37:28 -0400, Gary T. Corcoran wrote: > > >I don't think so. My understanding is that ATA100 uses the *same* > >cables as ATA66 - they were just able to squeeze another 33MHz of > >performance out of them. > > No. > >From http://www.ixbt-labs.com/storage/ata-100.html > > Having weighed all pro and contra, Quantum developed > a new ATA/100 interface with additional speed, which > allows transferring the data at 100MB/sec along the > host-to-drive bus and hence to unload the HDD buffer > memory. This new interface incorporates all the > innovations made to the cables and connectors > supporting ATA/66. Just to remind you let us say once > again that ATA/100 interface requires the same good > old 40-pin IDE cable used in ATA/66. However, since the > burst transfer rates have become considerably higher, > better protection against crosstalk and electromagnetic > noise interference turned out necessary. For this > particular purpose 40 additional ground lines were > tied together and acted as shields between the lines > that actually carried live signals back and forth. So, > altogether the new ATA/100 cable is composed of 80 > conductors. However, the developers wanted to retain > the conventional 40-pin connector, so that to ensure > plug compatibility with existing drives and systems. Huh? You seem to be disagreeing with me, yet as I read the above, it seems to agree with what I said: the ATA66 and ATA100 drives use the *same* 80 conductor (40 pin) cables. That is, ATA66 *already* added the extra 40 ground wires to make the cable 80 conductors, and ATA100 uses the same thing. The above is a little misleading, in that they (almost) imply that ATA66 uses the same cables as ATA33, which is NOT true... (I *do* have ATA66 cables, with 80 conductors :) Gary To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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