Problems Mounting HFS on Mac & Linux

["Individual . ." <individual@mi-mail.cl>]

Hi all!
When I did all the partitioning required for the installation of 
Debian, I left a 200 MB chunk to be used as an HFS exchange volume. 
Today, after I have got most everything sorted out, I decided to 
initialize it, create it, in other words, get it working. HD Setup 
wouldnt let me format just that little chunk of the disk, it said it 
had to wipe out everything, etc, etc, so I decided to use mac-fdisk 
under Linux. I created a new partition with the free space, called it 
"exchange" and made it of type Apple_HFS. Upon restarting into MacOS, 
however, it did not show up on the desktop and HD Setup does not list 
it as one of the partitions (in the List of Volumes it shows upon 
startup). I have a feeling there's something I'm missing here: would 
someone please point out what it is?

Thanx.

Paul