Brought this drive home from the Apple store to use with Time Machine and an iMac using USB 2. Set it up using LaCie's proprietary software. Started the first backup, which is supposed to take longer (about 250 GB). After 10 hours, the software told me the backup would take 2,400 days to complete--I'm not exaggerating. Downloaded fresh drivers and desktop software for the drive from LaCie's Web site and reformatted the disk with Disk Utility. Same result, with throughout of about 16K/second, which is outrageous. Drive is going back to the store tomorrow.