I tried that once and it was a PITA. iTunes looks for the music in the My Documents folder. Moving the music to an external drive confuses iTunes and even though you change the default setting on where music is saved, iTunes still wants the music in the My Documents folder.
If you just move the music, iTunes will not find it. You have to move the entire My Documents/My Music/iTunes folder. When you do this iTunes cannot find it.
Performance? Think about this. Data speed between your internal hard drive and your system is many times faster than across a USB-2 cable.
What might work is for you to uninstall iTunes, and reinstall it. But only if there is an option on where the music is stored.
i want to transfer my (currently 7 GB) i-tunes library from dell desktop to an external hard drive. i was told that removing that resident music from the desktop would enhance its performance, while of course my music stays intact. best buy has a 160 GB 2.5" western digital portable hard drive for $80 this week. i'm assuming that i would delete itunes from the desktop after relocating music onto the new portable drive, correct? and if so, am i accurate assuming the desktop's performance would be noticeably better? sys info: dell desktop-OS: XP Pro-serv pack 2; 2 GB memory; Pentium 4.