This is driving me nuts ... I have a 750gb FreeAgent external hard drive connected via usb. After some time it goes to sleep as it is inactive (I use it only for time machine backups!). When I open photoshop or after effects or when I initialize the save as / open in almost any app, a beach ball pops up and I can hear the external drive waking up from sleep, this lasts for 5-10 sec (the system is checking the drive(s)). This is so irritating. I don't want it to wake up nor do I want to save data to it (time machine backups only ...). Is there a way to stop the system from doing so ? Thanks in advance.