Hi When I plug in a hard disk to a PC (Fedora 9 X86_64) via a usb adapter, I got mant errors as below. when tried fdisk, parted or cfdisk, command just hanged there. produce may error lines sd 11:0:0:0: [sdf] Sense Key : No Sense [current] sd 11:0:0:0: [sdf] Add. Sense: No additional sense information is it a disk failure? best Y