Hi, I have three LaCie D2 Quadra external hard drives, which are daisy-chained to each other and than connected to the FW800-port of my iMac: iMac ^ ^ HD 1 - 1000 GB (iTunes Library) ^ HD 2 - 1000 GB (Backup of HD 1) ^ HD 3 - 500 GB (2 Partitions: 1. System Backup, 2. Misc Files) I've recently added the 3rd hard drive and now the drive speeds have dropped considerably!? Importing music into iTunes (copying to "HD 1"), editing music tags on the same drive and/or adding files to the "HD 3" drive takes much longer than before! "HD 1" is quite frequently used for music playback and video watching. "HD 2" is used once a day during the night for backup purposes only. "HD 3" is regularly used. The System Backup partition is rarely touched, but the Misc Files partition is used a lot! Any idea why the construct has become so slow? Would it solve the issue, if I would take one drive off from the daisy-chain, an connect it to another port (USB or FW400)? Thanks.