My iTunes is growing fast so I moved the library location to my FORMAC HD which is connected to my imac via FW800. However, when I was importing some CD's I noticed that iTunes had reverted to using the internal HD location. I can only assume this is because at some stage the disc had gone to a low power state and iTunes could no longer find the library and reverted to the original location. If I purchase a 1TB USB drive will this work better and allow iTunes to remain connected to the library as found on this drive? UPDATE : it seems I did not follow the process correctly. I did not realise that I have to tell iTunes at boot where the library is. Reading the support pages it seems I have to hold down the option key when booting iTunes and navigate to the path of the new library. Gonna try again..... another edit : Itunes now migrated on FORMAC drive (FW 8000) and backed un a external USB drive. Great... now got loads of GB's back on internal hard drive!