Right....there is no air disk with the Airport EXPRESS (the usb port is for wireless printing only).
Only the Airport Extreme (the rectangular one) and Time Capsules support a USB hard drive .
The iMac that I am connecting it has Leopard, the other Macbook Pros all have Snow... my question Rui is; how can let's say computer B & C connected to the external hard drive on computer A?Are the other computers running Leopard/Snow Leopard?
If they are you can easily share your hard drives By clicking in a window in the finder (left side). You may have to do some initial setting up for file sharing in your system preferences.
On the imac go into your system preferences, and then click 'sharing'. in that preference pane you're going to have to check the 'file sharing' box on the left. If you want everyone on the network to be able to access the drive the easiest way would be to make the drive a public folder. In the 'public folder' box click the '+' button and select the external. You can also set up the drive to be only accessible by certain users, and password protected....but thats a bit more involved and i'll leave it to you to research that.The iMac that I am connecting it has Leopard, the other Macbook Pros all have Snow... my question Rui is; how can let's say computer B & C connected to the external hard drive on computer A?
Don't I need to go to "GO/CONNECT TO SERVER" and then put the ip address of the iMac?
Yes sir, I think you right... cause it doesn't load on my PPC iMac but rather on my MacBook Pros that are all Intel... and I can't format cause I really do not want to loose any of the stuff I have on my external drive.I note with interest that the drive in question is formatted "Apple Partition Map," which is used primarily by pre-Leopard, pre-Intel Macs. You may wish to reformat that to GUID, particularly if you ever want to use that drive as an Intel-bootable backup.