Win7 system when copying files prompts "MS-DOS function is invalid" reason and solution

Win7 system when copying files Prompt "MS-DOS function is invalid" reason:

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; then the optical drive reads at a higher speed and there is a problem.

2. This happens when you copy files from a removable hard disk or a USB flash drive. Most of them are caused by file corruption or bad sectors on the mobile hard disk.

3, the operating system also has a certain relationship

Solution:

1, try to use professional COPY software to copy files;

2, try Make a backup on the mobile hard disk itself, such as bad sectors. You can only use the formatted and then repair the bad sectors or shield the bad sectors to reuse the hard disk.

The above is the reason and solution for prompting "when MS-DOS function is invalid" when copying files in Win7 system. Friends who have the same problem can try to solve it.