iTunes library consolidation problem

Hi,

I'm stuck on this one. I used to have a large iTunes library that I stored on a pocket drive external to my laptop. I've recently cut it down from 150Gb to about 113Gb, which I figure I can copy back on to my laptop (130Gb free space). However iTunes is insisting that there isn't enough space on my drive, even though there should be a spare 17Gb. Are there any settings that might be making iTunes think the library is bigger than it is?

Thanks,

Sam