I have a 2600-song lossless library. When I was using Apple Lossless, all 2650 songs converted to 128Kbps on the fly without a problem. Then for archival purposes, I switched to AIFF. Now, it says it doesn't have enough space for the converted 128Kbps library! iTunes is acting really weird! I confirmed through my tests that both Apple Lossless and AIFF versions of a song will result in the exact same size 128Kbps AAC copy when converted, but iTunes keeps saying that I will run out of space if I use AIFF but not when I use ALAC. Anyone know a fix to this? I tried everything short of a restore, which I really do not want to do currently. Thanks. P.S. I can totally hear the difference between ALAC and AIFF. WOW!