[lug] ide drive questions

Kevin Fenzi kevin at scrye.com
Thu Jan 11 16:45:25 MST 2007

On Thu, 11 Jan 2007 14:45:28 -0800 (PST)
horlenkarl at yahoo.com (karl horlen) wrote:

> i have a system with 4 ide devices
> 2 hard drives
> 1 cdrw 
> 1 dvd
> file copies and moves between drives are slow.  i
> think it's because the hard drives share the same ide
> channel and the cdrw/dvd share the other.  my thought
> is that the file ops would be quicker if the drives
> were on separate channels.
> is this true?

Yes, there are limitations with 2 drives on the same channel trying to
use the same ide bus. 

You could also have a ide controller that doesn't support DMA or
unmasked irq's or other things. If it's a pretty new ide controller
however, thats likely not the case. You can see by doing a
'hdparm /dev/hda' or the like. 
> if so, is it possible to put each hard drive on a
> separate channel and then have the hd share that
> channel with a slower device (dvd / cdrw)?

Sure. Just move the drives/devices and then make sure you have their
jumpers configured for the appropriate master/slave setting. 

> i thought the slowest device on the channel is the
> determining factor for the channel speed.

I don't think thats the case... it's more of a matter of IDE channel
bandwidth. If one drive is sending a bunch of data over the channel, the
other drive has to try and fight with it to get data out. There is only
so much that will fit at once. 


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