Win7 Computer making U disk boot when prompted to boot sector unknown how to do?

For today's users, to reload the system must be to find a more convenient way, after all, now there are so many methods can be selected, so what is the most simple and convenient? Many friends first pushed the U disk to start the way, and even a lot of users began to learn the online tutorial do-it-Yourself Start tool, But recently seems to have friends in the production of this U disk startup tool encountered difficulties, it seems that ghost Win7 system download will be prompted to say that the guidance sector is unknown, this is what kind of problem, and how to deal with it? Below, let the small series to introduce a detailed!

The first situation: you can first check your own used to make U disk startup tools, whether it is already partitioned, if so, then, because it is this U disk partition caused by the unknown boot sector. You can find tools on the Internet to merge the partitions here.

The second situation: in addition to the U disk problem, perhaps we have a problem with the operation, although there are many tutorials on the web, but there are many tutorials itself, such as the user mentioned before, in the selection of mirror files, should not choose to open, but should choose to add. Although it looks similar, the effect is completely different.

The third situation: U disk chip problem, this may be a cause of failure, we can find relevant detection tools on the Internet, if found to be a failure, you can directly volume production, and then recreate the U disk startup tool.