From owner-freebsd-hardware Fri Apr 12 09:31:17 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id JAA16205 for hardware-outgoing; Fri, 12 Apr 1996 09:31:17 -0700 (PDT) Received: from lserver.infoworld.com (lserver.infoworld.com [192.216.48.4]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id JAA16200 for ; Fri, 12 Apr 1996 09:31:15 -0700 (PDT) Received: from ccgate.infoworld.com by lserver.infoworld.com with smtp (Smail3.1.29.1 #12) id m0u7lt1-000wsXC; Fri, 12 Apr 96 09:39 PDT Received: from cc:Mail by ccgate.infoworld.com id AA829326577; Fri, 12 Apr 96 08:20:02 PST Date: Fri, 12 Apr 96 08:20:02 PST From: "Brett Glass" Message-Id: <9603128293.AA829326577@ccgate.infoworld.com> To: Michael Smith , jacs@gnome.co.uk Cc: hardware@FreeBSD.ORG Subject: Re: Micropolis 1991 AV 9GB Drive Sender: owner-hardware@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > Bear in mind that both these units are _slow_, Average access times are supposed to be 11 ms. The fastest commonly available drives are 8 ms, and the latest PC IDE drives sit at 12 ms or so. Also, the 9 GB drives have huge amounts of data per cylinder and fast spindle speeds. Why would they be slow? > and require specialised cooling to avoid thermal overload and premature > death, I've never cooled one of these in any special way. Most dissipate less power than the 40 MB Seagates I was using 10 years ago. What experiences have you had to indicate that they need better cooling? > as well as a _serious_ power supply. A normal PC chassis is > _totally_ inappropriate for these disks. I am now working on a review of several such disks, packaged in external SCSI boxes for the Macintosh. None had anywhere near as big a power supply as your typical tower case (250-300W). If you've had speed problems with these drives, or have had them overheat, I'd like to know about it -- it'd be worth trying to verify this information. --Brett