Using USB drive between Leopard and Snow Leopard

I have 2 USB drives that were formatted as Mac OS Extended (Journaled) on a Leopard Macbook Pro. I have had no troubles when using these drives between Leopard OS machines however when i try to copy files to them from a Snow Leopard machine an error message appears.
Secondly when i tried to copy files from the USB onto the Snow Leopard (Macbook Pro) only the folders were visible and not their content. When I "Got Info" on the USB via Snow Leopard it showed that data space was being used.
Can anyone tell me if Mac OS Extended is the standard Mac format type then why this might occur and hopefully a solution? I would like to upgrade to Snow Leopard but do not want to lose the data on my external drives formatted on Leopard.
I appreciate the brains trust!!

Was the computer that didn't work logged on to the "owner' of the images own account, or were you using a 'guest" log-in, kicks?
If the different computers were set up in a different fashion for such things then it might explain the different behaviour.
Another thing that could prevent a Mac writing to an external drive would be if the external drive itself is formatted with the NTFS file system (common on many windows drives). Unless the mac concerned has additional software installed then it can't write to an NTFS drive. Perhaps the ones that could write have the necessary patches installed?
A final issue may be power. Was this a self powered drive or a bus powered drive? Computers that follow very closely the official USB specs often have trouble powering a "bus powered" drive effectively from a single port. In this case trying a "Y" cable, letting you connect to two USB ports on the same computer, will usually get things working. Some Macs seem better than others in this situation, and even the actual USB port used may make some difference.
Cheers
Rod
Message was edited by: Rod Hagen

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