Date: Sat, 16 Jun 2001 08:05:26 +0200 (MEST) From: Jean-Francois Dockes <jean-francois.dockes@wanadoo.fr> To: "Kenneth D. Merry" <ken@kdm.org> Cc: "Roman Y. Bogdanov" <peps37@ktk.ru>, freebsd-scsi@FreeBSD.ORG Subject: Re: CD speed? Message-ID: <200106160605.IAA60799@hautmedoc.dockes.com> In-Reply-To: <20010615125447.A1613@panzer.kdm.org> References: <482746108.20010616024401@ktk.ru> <20010615125447.A1613@panzer.kdm.org>
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Kenneth D. Merry writes: > On Sat, Jun 16, 2001 at 02:44:01 +0800, Roman Y. Bogdanov wrote: > > I have plextor px-40 SCSI II CDROM. > > Can I use camcontrol for change speed setting of this cdrom? > [skip] > My guess is the speed is set in a mode page somewhere, so if you really > want to set it, you can try hunting around in the mode pages. (See the > camcontrol(8) man page for details.) I think that plextor uses (nonstandard?) mode select page code 0x31 for setting the speed. The page is like: byte0 0x31 byte1 0x02 byte2 speedfactor byte3 Rsvd|DisAv|DisWt|SpdMode byte 3 is probably best left to 0. (DisAv: disable avoid vibration, DisWt: disable waiting, SpdMode affects speed handling during error recovery) Speedfactor is what you want to play with. 0 is normally 1X, 0xff max speed. Values between 0 and 0xff increase the speed in ways that depend on the drive model. This probably works also with some other brands. Also, this normally only affects READ, not PLAY :) JF To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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