I have used Win7 for a long time, before Linux has been on the mobile hard disk, now it feels a little troublesome and slower, so it feels better on a hard disk! It should be at this time of a year ago. I have been through RedHat 9.0 and win7. The result is a black screen Grub error. At that time, because of impatientness, I reloaded it back to Win7. This problem has not been solved! I have a big purpose this time is & lsquo;retrieve & rsquo; that black screen, and then solve it! Well, now open: First: I want to back up the data on the hard disk, and the mobile hard disk has only one partition, take this opportunity to sort it out. But the data inside is full! So the next big problem is partitioning in the case of lossless data. Use the software WinPm & agrave; resize /move to perform related operations, here is not too cumbersome! But everyone must be careful when operating, I lost 100G things, but the most important 10G is, haha! After doing the above, when you restart, you may be prompted with the following error message (I am also one of the lucky ones) Your Disks were modified by Paragon Partition Engine!Insert itsboot diskette and preess any key This error is due to the use of partitioning software Something went wrong, so the system could not boot properly! This problem can be solved like this! First use winPE to enter the system, and in the winPE generally comes with partition software, my diskGenius, use it to "rebuild the master boot record (MBR)". Then restart, if not normal, the following message will appear: The boot selection failed because a required device is inaccessible at this time can use win7 system disk & lsquo; repair computer & rsquo;, it will automatically repair the relevant MBR information! If you don't have a Win7 system disk, you can download a Win7 image, use UltraISO to write it to a USB disk or engrave it into a mirrored disc. Next, start to install Win7, or use the system disk you just made, in the partition, give Win7 The partition is not repeated, there are a variety of methods at this time: 1, the remaining unallocated space (convenient to install Linux), 2 must be allocated extended partition. Show Next: The distribution version I chose for Linux is fedora14. Because of the problem with the optical drive, it is still installed with a USB flash drive. First edit the fedora14 boot disk. At this time, restart the installation, boot from the U disk, the system will be stuck in a screen, prompt: Press the <Enter> key to begin the installation process. The solution to this problem is: download a ISO image of fedora13, which will be under isolinux The vesamenu.c32 is extracted, covering vesamenu.c32 in syslinux under U disk. Then restart …… normal installation …… because I have some space left in the AW7 partition, so install it at the time of selection. When I go, I choose to use the remaining space, so there will be no conflict with other, there are many ways, interested can try! Then the installation is successful. To my surprise, after the security, there was no black screen, and both guides were normal, and there was no chance to exercise grub. I wouldn’t be tossed and had the opportunity to try it on the virtual machine. Let's go! Finally: After the configuration is installed, the default system of the system is fedora14. Then find the fedora14, edit the /boot/grub/grub.conf with vi as shown below. You can see that there are two titles, namely the corresponding fedora 14 and Win7 (other) where default represents the default selected system, the value of 1 means other-> win7, if the value is 0 means fedora. By modifying this value you can set the default operating system. This is not a way to find the settings in win7, but it should be possible through some software. This way, the dual system configuration is complete, haha! Note: 1, WinPM, the speed is too slow, and the last inexplicable I /O error, resulting in my data loss. I used a very useful software when I was getting a computer for someone else. I couldn’t find it. I haven’t found it for a long time, so I can only take it! 2, after installing the Linux disk with U disk, after the image is engraved into the U disk, the original ISO image should also be placed in the U disk, because the U disk method is equivalent to the hard disk installation. However, the package folder in the U disk is too large and useless, so it can be deleted. Such a 4G U disk should be almost the same!