From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out.tiscali.be (spoolo1.tiscali.be [62.235.13.210]) by dsl2.external.hp.com (Postfix) with ESMTP id 039714840 for ; Fri, 21 Nov 2003 13:22:56 -0700 (MST) Message-ID: <3FBE742D.9010507@tiscali.be> Date: Fri, 21 Nov 2003 20:23:09 +0000 From: Joel Soete MIME-Version: 1.0 To: "M. Grabert" Cc: Steve Bromwich , Grant Grundler , JjDunnjr@aol.com, parisc-linux@lists.parisc-linux.org Subject: Re: [parisc-linux] Boot-up challenges on a 715/75 References: <1e2.13b31f0d.2cebe9ab@aol.com> <20031119055936.GA17873@colo.lackof.org> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Sender: parisc-linux-admin@lists.parisc-linux.org Errors-To: parisc-linux-admin@lists.parisc-linux.org List-Help: List-Post: List-Subscribe: , List-Id: parisc-linux developers list List-Unsubscribe: , List-Archive: Hello Max, M. Grabert wrote: > On Wed, 19 Nov 2003, Steve Bromwich wrote: > > >>On Tue, 18 Nov 2003, Grant Grundler wrote: >> >> >>>On Tue, Nov 18, 2003 at 08:38:00PM -0400, Steve Bromwich wrote: >>> >>>>I believe HP machines use a 512 byte sector CD drives (with the standard >>>>being 2048 byte). I'm not sure off-hand if the TEAC supports 512 byte >>>>sectors. Your best bet may be to borrow a CD off a Sun machine, if you >>>>have access to one. >>> >>>I'm only aware of HP using 2k sectors for CD-RO. >> >>Well, this is just from my own personal experience on a 715/75 (which has >>now sadly bitten the dust). A google around would tend to support this >>theory, for example: >> >>http://lists.parisc-linux.org/pipermail/parisc-linux/2000-September/009345.html >>"Last posting to the list was about my SCSI CD-ROM not booting the >>HP-UX INSTALL CD. Well, it turns out that NECs are in 2048 byte sector >>mode whereas HP requires 512 byte mode. SUNs and SGIs also require 512 >>byte sector mode. So I just borrowed a SUN external CD-ROM..." >> >> >>>I've never heard of 512 byte sectors in a CD Drive. >>>Is that a feature unique to CD-RW? >> >>It's the standard for Sun boxes (at least, on all my Sparcstations). This >>of course means I don't have any SCSI 2048 byte CD drives to verify my >>statement! If anyone else would like to verify it I'd be interested, and I >>suppose it might not be a bad idea to add it to the FAQ if true as I'm >>sure it'll bite someone else down the road. > > > I have several risc boxes (SGI O2, Alpha AS500, Dec 5000, Sun SS20s and HPs), > all of them use 512bytes/sector. I'm actually not aware of any non-intel > platform that uses 2048bytes/sector for SCSI CD-drives. > hmm excepted HP (trust me, when I build a custom cd with Ignite to upgrade our ws (about 80 of various model: 712, b132, b180 & c110) from 10.01 to 10.20, I have to take care of this detail to build the basic fs) > I once ran into the problem that I couldn't boot from CD using an old Sun > SPARCstationLX, since the SCSI CD-drive was set to 2048bytes/sector. > > Most SCSI-CD drives have a switch/jumper to select the default > bytes/sector (ie. 512 or 2048). Most 'newer' drives support to be switched > to either mode via software. 'Newer' meaning less than 8 years old. > > However old workstations (like the old SPARCstation I presume) don't > support to switch the SCSI-CD-drive to the 512 mode, so you HAVE to set > the jumper on the back of the drive. > > I doubt you'll find any SCSI CD-drives on the market (second hand or new) > that are so old that they support only one of these modes. I bought a > TEAC CD-writer and a Pioneer CD-drive in a ordinary PC shop about 6 years > ago, and they support both modes (and I even couldn't find any that couldn't). > They work with all SCSI machines I have. > > Thanks for those all info (well I don't have to manage a so wide range of ws supplier) but I ignored this before ;) Joel