修改grub.cfg
menuentry 'Windows 7'{ insmod ntfs set root='hd0,msdos3' search --no-floppy --fs-uuid --set B2C49581C495490D chainloader +1 }
menuentry 'Windows 7'{ insmod ntfs set root='hd0,msdos3' search --no-floppy --fs-uuid --set B2C49581C495490D chainloader +1 }