Dear All I needed to clone my disk to another hard drive . I did it as the following : #dd if=/dev/sdb of=/dev/sdc But after a while, the procedure ended with the "writing to /dev/sdc input/output error" message. Can you please let me know how can I overcome this as the fdisk now returns as " #fdisk /dev/sdc "I do not know how to handle files with mode 81a4 must set cylinders" What can I do at know ? Thank you