iMac Update 1.1

In response to initial customer and developer feedback, Apple has made improvements to its Universal Serial Bus (USB) software for iMac customers. The iMac Update 1.1 includes these improvements, which enhance the experience with many USB peripherals, as well as enhancements previously released in iMac Update 1.0. While Apple suggests that every iMac user install this update, it notes that only those using additional USB devices other than the Apple USB keyboard and Apple USB mouse included with the iMac are likely to notice the improvements after installation. This version improves the identification of USB devices during start-up and more.
Note: You must install the iMac Firmware Update before installing the iMac Update 1.1.