Authorization: 2 startup disks = 1 or 2 "devices"?

Apple/iTunes allows me to use purchased/licensed content only on a limited number of devices (if I understand the terms correctly, that's 10 devices, with a maximum of 5 computers).
Now when I have one machine (e.g. a MacBook) with two separate OS X installations (e.g. Lion on the internal HD and Snow Leopard on an external HD) and install/use iTunes on both of these, do these count as two computers?
Or does iTunes determine the machine based on hardware specs and use up only one count here?
Thanks in advance!

The only thing I can think of is disk format, although I am hoping this is not the case.
It is. The Time Capsule can't read a disk or partition in the NTFS format. Anything connected to the Time Capsule's USB port is considered to be a network drive under its control and the capabilities and limitations of the computers on the network with regards to filesystems are ignored for those drives.
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