Alright. I have approximately 250gb of music currently on a Western Digital. Here are the supposed specs of the device - WD 750GB / 7200RPM / 9 ms Seek Time / 16mb Cache Drive OEM. It's currently formatted in NTFS. But I seem to be having a tremendous amount of trouble using it with iTunes. What I did was just add all the files and folders to iTunes to read directly from the drive. However... After adding everything, it is EXTREMELY slow going. I get the twirly rainbow every time I try to scroll down the list. Am I using the wrong type of drive? Thank you.