I have a Toshiba 500gb external hard disk. Ive been using it for 5 years , then one day i cat open it on my computer,i tried it on other computers and still gets the same result. My computer detects it but it just shows Local Disk D; without the memory allocation bar. I tried opening it but it says data error (cyclic redundancy check). I also tried using different cables but nothing happens. I need the files in it. Please help me. Thanks in advance.