Ide
 

I installed my redhat 7.0 kernel 2.2.16-22

Because of my short ide cable
i installed my cdrom on /dev/hda
and my harddisk on /dev/hdb
is that a problem?

Shouldn't be a problem. RedHat will know which is a harddrive and which is a cdrom. You may or may not have to point it out during the install. But can't think of any reasons it wouldn't work.

Ok, got it. what about other os.
i am trying to install slackware too.. but is difficult..

Slack isn't too bad, just let people know where you're at and they'll help. As for other OS's and your actual 'physical' setup haveing the cdrom as master I take it? Shouldn't be a problem, Doesn't really matter which is first on the cable etc...You still only have one HD, so that'll be what the OS see's/needs.

Well maybe i should try it next week
from those article i read before slack give me an image is quite long life span for next reboot.(high uptime)