First I would like to sincerely thank everyone on this forum for their time. I have been using windows from day one and have just switched about a month ago. I purchased an early 2008 24" iMac 2.8Ghz a month ago. It is awesome. This forum is amazing and was a great help in deciding to make the switch. Two days ago hooked up an iomega ultramax 500 drive as my time machine drive. Installation was a breeze. I notice it accesses the drive quite frequently. (Not just for hourly backups). Is this normal? Also, I just received this error: "Time Machine error- Unable to complete backup. An error occurred while copying files to backup volume" I clicked ok and then did a "backup now" which ran fine. Wonder what happened. Should I be concerned about these two issues? Thank you so much for your help.