Win7 system copy file prompt "MS-DOS function is invalid" Causes and solutions

1, may be in the process of burning the disc (such as the quality of the disc or incompatible with the optical drive, etc.), resulting in the so-called " Frisbee & rdquo; So the optical drive reads at a higher speed and there is a problem.
2. This happens when you copy files from a mobile hard disk or a USB flash drive. Most of them are caused by file corruption or bad sectors of the mobile hard disk.
3, the operating system also has a certain relationship, this problem can try to use professional COPY software to copy files, if not, you can try to make a backup on the mobile hard disk itself, such as bad sectors, only format After repairing, repair the bad track or shield the bad track to reuse the hard disk.