While using NOD32 to scan a file, which checked good, first saw: Error occurred while scanning MBR sector of the 2. physical disk. Error reading sector. Did search and was glad to find: https://www.wilderssecurity.com/showpost.php?p=82049&postcount=12 Yesterday I started using a usb printer that has a flash media reader - can load media and preview on printer lcd, then print. The usb printer media reader appears as a 'Removable Disk'. So, given old thread posts, disabled disk, scanned a file, no error message. Enabled disk, scanned a file, error message. 'Safely removed' disk, stopped, using icon in systray. Scanned a file, no error message. Do not, though, understand why NOD32 gives this error message.