mounting another disk

Hi All,
  I feel real stupid asking this question as it had already been answered about 
a month ago for me. At the time I asked I was not in a position to use the info 
and have since lost all my mail. A long story.

  I have replaced my RH7.2 hard disks with another and have installed RH 9.0 on 
it. What I would like to do, now that I have the 9.0 system up, is somehow get 
my other two 7.2 disks online so I can reference files on them.

  I am sure it can't be that difficult but I am paranoid to try this for fear 
of losing the data on the 7.2 disks.

Any help will be greatly appreciated.

Oh, I wish this list had a searchable archive.

Thanks.