Card reader without card will cause error like - Error occured while scanning MBR sector of the 7. physical disk. Error reading sector. As card reader creates disks 6, 7, 8, 9, that could be normal. But, scanning from context menu shows - MBR sector of the 1. physical disk is OK. Error occured while scanning active boot sector of the 1. physical disk. Error reading sector. Error reading sector. This can be reproduced with any comuter and any card reader I have tried.