Drive Letter

I have an external Firewire HD that was used on a computer that I own that I
would like to transfer to another system. The drive and its partitions were
assigned drive letters by the system it was on. If I plug this drive into a
Firewire card on my new system what will happen? Will the OS on the new system
simply assign each partition a new drive letter on the new system (none of the
partitions were bootable...they were all used for storage and are in the same
NTFS file system as the new system? Any roblems to be expected or is this just
a 'Plug 'n Play' experience.

Howard