At Wednesday, 16-10-02 13:32 (+0000), Voytek Eymont wrote: >** Reply to note from Adam Hewitt <[EMAIL PROTECTED]> 16 Oct 2002 >12:18:14 +1000 > > > > And I have been doing computer technician work for about 8 years now and > > I have always placed the CD ROM on the secondary IDE channel. The reason > > for this (and I admit I have never done any testing myself to find out > > if this is true) is that the IDE channel will default to the slowest > > speed on the ribbon cable, so if you have a hard drive and a cd drive > > located on the same IDE ribbon cable it will slow your hard drive speed > > down. > > > > If you think this is incorrect or have actually run tests regarding this > > please let me know. > >Adam, > >on a perhaps related issue, I have been told it's a 'bad idea' to have a >slow device such as a scanner on one SCSI buss, as, it will bring the whole >SCSI chain to the lowest common speed.
Yes and no. The SCSI bus will default to the slowest speed only when doing transfer to that device. If you are using the HDD and not the scanner, the bus will run at the highest speed supported by the HDD and host adaptor. >I have a single AHA2940UWP running three chains: >external narrow: HP scanner and Yamaha CDRW >internal wide: 2 UW HDs , >internal narrow: two narrow devices: CDROM, DAT. > >I was told 'bad idea, get a second SCSI controller for scanner' > >so, one day, I run some HD benchmarks, as is, with all stuff working; >then, progressively, I removed everything down to the single HD. > >interestingly, the HD benchmarks didn't vary, regardless > >so, I still only use a single SCSI controller. > >of course, IDE isn't SCSI, and, YMMV, etc > > > > > >Voytek Eymont >SBT Information Systems Pty Ltd >http://www.sbt.net.au/links/ >phone +61-2 9310-1144 fax +61-2 9310-1118 >-- >SLUG - Sydney Linux User's Group - http://slug.org.au/ >More Info: http://lists.slug.org.au/listinfo/slug -- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
