I've determined that I need to move my iTunes Library to an external drive. I am running out of room on my HD because of movies in iTunes and home movies which I have been importing and cataloging in iMovie. I had originally decided to put all of my iMovie files on the external, but was told by some very intelligent people that editing would be anything but 'optimal' over an external drive. Even with a RAID 0 drive. Instead, I've determined that my best option would be to put my iTunes Library on an external drive since it takes considerably less bandwidth to do basic functions in iTunes than in iMovie. My question to you is regarding the potential lag with my iTunes connected through an external drive. I am specifically looking for input from those of you who are currently runnning your libraries from an external drive. There are a number of different ways I could go from here... and depending on what I hear in regards to the 'lag issue', I will pick the best one and go from there. P.S. I want the system to be backed up at least once, so I will have to buy two drives, or 1 RAID drive. Purchase 2 Standard 750GB FW800 HDs: Probably the least expensive option. Backups done weekly by 'dragging and dropping' iTunes folder to secondary drive or setting up a software RAID through Disk Utility. Not upgradeable without replacing the drive. If my library goes over 750GB, the drives become obsolete. Purchase 1 750GB RAID 0 FW800 Drive and 1 Standard Drive: The fastest option. RAID 0 and Firewire 800 would provide the fastest streaming of data from the HD, and be the least likely to produce 'lag'. I would back it up (speed not important) with the standard FW800 drive. Drives can be replaced for larger ones in RAID drive. Purchase 1 1.5TB RAID 1 FW800 Drive: Built-In redundancy (save it once, it duplicates the file for you on the second HD) Roughly same speed as first option. Large bulky hardware I woudn't want near my desk. Not quite as safe as first two options? Drives can be replaced for larger ones. Purchase a Drobo, add drives as necessary: Seems like the best long-term solution as far as I/O's go. More data for less money. Tied to a proprietary system which packages data in a way that can not be read by any other hardware. If the sytem goes bad, you have to buy another Drobo to recover data. Still, VERY slick interface, incredibly adjustability. Only has USB 2.0 which would mean slower file transfers. Additional drives can be purchased at any time. Purchase a drobo, connect over network through AEBS: The slowest option, but the best as far as 'looks' are concerned. Nothing cluttering up my desk, no noisy fan in the room, etc. I am very concerned about lag with this one though... I wish I had some real-world advice on this one. Additional drives can be purchased at any time. If you have any experience with any of these, can attest to the 'lag' (or lack thereof) I would love to hear from you. If you have any input at all, it would be very helpful... as I am working a little 'over my head' here. If I am going to spend between $400 and $700, I need to make sure I'm buying something functional and a good quality long-term solution!