Date: Sat, 17 Feb 1996 19:50:38 +0100 From: se@zpr.uni-koeln.de (Stefan Esser) To: Ulrich Callmeier <uc@brian.lunetix.de> Cc: freebsd-hardware@freebsd.org Subject: Re: Fast and reliable 2GB disk Message-ID: <199602171850.AA19016@Sysiphos> In-Reply-To: Ulrich Callmeier <uc@brian.lunetix.de> "Fast and reliable 2GB disk" (Feb 17, 17:16)
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On Feb 17, 17:16, Ulrich Callmeier wrote: } Subject: Fast and reliable 2GB disk } Hi, } } I'm currently looking for a 2 GB disk (SCSI) that is both fast and reliable. } What do you all think about the Quantum Atlas? Anyone good or bad experience } with it? Is it true that Quantum has problems with their SCSI-interface } as the german journal c't writes, or is this only for the Empire-series? Hallo Ulrich! Yes, I've been using a Quantum Atlas 2GB for nearly one year now, and it appears to be a well designed drive. I'm using it in a min-tower case, where it doesn't need a dedicated mini fan of its own, due to good air flow design. You may or may not need a fan to keep it cool ... The Atlas was a DEC design, originally. And those drives had a good name for reliability and performance, though they often were noisy when seeking. There is a reason that the Grand-Prix is so much cheaper (especially the 4GB version). A lot of people have reported problems using the Grand-Prix with different SCSI host adapters and operating systems. } Any other recommendations? Well, there is a 2GB 7200RPM drive from IBM, which is offered for 70% of the price of the 2GB Atlas ... According to "Alternate" (c't 3/96, p. 387) it is a 7200RPM, 7ms seek drive with 512KB cache. >From the IBM Almaden web server: http://www-i.almaden.ibm.com/storage/oem/specs/jfhs50p.htm Specifications Model number.................... DFHS-31080 DFHS-32160 DFHS-34320 Capacity........................ 1120MB 2250MB 4510MB Number of disks................. 2 4 8 User data heads (trk/cyl)....... 4 8 16 Average seek Read (ms).......... 6.9 7.5 8.0 Interface....................... SCSI-2 FAST Media data rate (ms)............ 9.59-12.58 Sustained data rate (MB/sec).... 7.0 SCSI Interface transfer Rate.... 10.0 or 20.0 (sync) (MB/sec) Data Buffer, segmented (KB)..... 512 Rotational speed (RPM).......... 7200 Areal density (Mb/sp. in.)...... 544 maximum Track density (TPI)............. 4352 Recording density (BPI)......... 125,000 maximum MTBF (power on hours)........... 1,000,000 (The media data rate is in MB/s, not in milli seconds, obviously ... Don't know why the sustained data rate comes out so much lower, but it is at least as good as the Atlas, anyway.) They don't know about a DFRS, only about the DFHS, and I'm not sure whether the first is the successor of the second, or the names got confused in some way ... Prices in Germany are (c't 3/96): DM $ ----------------------------------- Computer Profis 839,-- 490 Publix 859,-- 500 Alternate: 929,-- 540 (DM = $ * 1.50 +15% VAT) Please let us know what you think of this drive if you actually buy one ... Regards, STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/~se <se@ZPR.Uni-Koeln.DE>
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