一、BIOS方式，grub2安装
查看磁盘情况
E:\grub-2.02-for-windows>wmic diskdrive list briefCaption DeviceID Model Partitions SizeINTEL SSDSCKKF256H6L \\.\PHYSICALDRIVE0 INTEL SSDSCKKF256H6L 3 256052966400SanDisk Ultra USB Device \\.\PHYSICALDRIVE1 SanDisk Ultra USB Device 2 30746096640
grub2 mbr安装
E:\grub-2.02-for-windows>grub-install.exe --target=i386-pc \\.\PHYSICALDRIVE1Installing for i386-pc platform.Installation finished. No error reported.
二、UEFI方式，grub2安装
grub2 UEFI安装
1、给Sandisk Ultra U盘在末段分一个 FAT32 格式的分区，并且改变分区类型为：
0xEF Partition with an EFI file system 【可能需要】
2、导入EFI目录到U盘ESP分区的根目录，导入grub程序文件到U盘ESP分区的boot目录。
C:\WINDOWS\system32>f:D:\>cd grub-2.02-for-windowsD:\grub-2.02-for-windows>grub-install.exe --target=x86_64-efi --efi-directory=d: --boot-directory=d:\boot --bootloader-id=boot --modules="part_msdos fat normal"Installing for x86_64-efi platform.Installation finished. No error reported.
把D盘替换成U盘ESP分区实际盘符
3、把ESP分区下\EFI\boot\目录下的grubx64.efi文件改名为bootx64.efi
4、编写grub.cfg配置文件，复制对应的ESP分区下\boot\grub目录下
set timeout=300
#set prefix=(${root})/boot/Grub/
menuentry "BIOS Windows Boot Manager" {
echo "BIOS Windows Boot Manager" #set root=(hd0,msdos1) insmod ntldr ntldr (hd0,msdos1)/boot/bootmgr}menuentry "BIOS Install CentOS71511"{
echo "BIOS Install CentOS71511 Minimal" set root=(hd0,msdos1) linux /isolinux/vmlinuz inst.stage2=hd:LABEL=ULTRA:/ quiet initrd /isolinux/initrd.img}menuentry "BIOS Install CentOS71511 ks"{
echo "BIOS Install CentOS71511 Minimal ks" set root=(hd0,msdos1) linux /isolinux/vmlinuz inst.stage2=hd:LABEL=ULTRA:/ inst.ks=hd:LABEL=ULTRA:/isolinux/ks.cfg quiet initrd /isolinux/initrd.img}menuentry " "{
configfile}menuentry "EFI Windows Boot Manager" {
echo "EFI Windows Boot Manager" #search --file ($root)/efi/Microsoft/boot/bootmgfw.efi --set=root terminal_output console chainloader (hd0,msdos1)/efi/Microsoft/boot/bootmgfw.efi}menuentry 'EFI Install CentOS 7' --class fedora --class gnu-linux --class gnu --class os {
echo "EFI Install CentOS71511 Minimal" set root=(hd0,msdos1) linux /isolinux/vmlinuz inst.stage2=hd:LABEL=ULTRA:/ quiet initrd /isolinux/initrd.img}
menuentry " "{
configfile}menuentry "DiskGenuis Tool"{
set root='(hd0,msdos1)' linux16 /boot/Grub/memdisk initrd16 /PE/imgs/DG_x64.img}menuentry "Maxdos Toolbox"{
set root='(hd0,msdos1)' linux16 /boot/Grub/memdisk initrd16 /PE/imgs/maxdos9.img} menuentry 'Reboot' --class reboot { echo 'Rebooting ...'reboot}menuentry 'Shutdown' --class halt {
echo 'Shutdown ...'halt}