On Tue, 19 Nov 2002, Alvin Oga wrote: > > > -- any system ... no matter how fast/slow, is working well > > > if the ( buffered disk reads ) timing is at least 50% of the rated disk > > > speed of 66MB or 100MB or 133MB or rated sata 160MB or rated scsi > > > speeds > > > - have not see any system achive full-rated-disk-tranfers > > Isn't this strongly dependent on the disk drive subsystem, not just the > > controller?
> > its more dependent on the motherboard ( onboard ide controller chips ) > > - same disk will under-perform by 1/2 or more if a slow/bad ide driver on > the "bad" mb > - all else staying the same/unchanged > > - don't get cheap mb... :-) > I think I see the confusion. You're getting disk media speed, and interface speed confused. I could have a udma-4 drive with low density platters, at 5400 rpm, compared to a 7200 udma-4 with 80 gig platters. The interface is the same, at ata-100. But the buffered disk speed is going to be a LOT more, and that can't be explained by ide controller chips. It's going to be the hard drive itself. Yes, slow cpu's and chips can cripple performance, I have many p120's here with 100+ gig drives in them, that are limited to about 10 meg a second. In an uncrippled machine, such as the P4 2.4ghz sitting here, it does 40ish, which is close to the actual media speed, not the ultra-133 interface. We're probably a year away from seeing ultra-133 saturated :) Mike -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
