Hi I have big file (133Gb) backup file on my hard drive and I wanted to move this to external hard drive (Seagate FreeAgent GoFlex Drive). When I tried it to move or copy to the external I've got message: Error 0x8007045D: The request could not be performed because of an I/O device error. I was looking online for some help and I found some advice that I have to make chkdsk in cmd mode but when I tried I've got message: "Chkdsk" is not recognized as a internal or external command, operable program or batch file. I don't know how to solve this problem. Can someone help me? My OS is win 7 Enterprise x86. Thanks in advance.