This extension addresses a problem whereby internal IDE drives on certain products emit audible noise. This problem is only found on Macintosh LC 580, Performa 58x series, Macintosh LC630, Performa 63x series and PowerMac 5200/75 computers. This extension will load during boot time. It detects the firmware version and drive type of your internal hard drive. If the firmware and drive type require update, the extension will download the new firmware into the drive. Once the install occurs, the extension is no longer required.