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+```bash
+umount /dev/sdb1
+dd if=/dev/zero of=/dev/sdb bs=512 count=1
+fdisk /dev/sdb
+```
+## Then to create the first exFAT partition;
+第一个分区要是windows可以认得的，不然放在第二分区，windows认不得。exfat好处是可以放超过4g的文件
+
+type n and then press enter to create a new
+p to create a primary
+1 to create the first primary partition
+just press enter to start at the default sector
+type -50M to set the size minus 50M (if prompted to remove signature, press Y)
+t for enabling type
+7 to set the partition type to exFAT
+
+## Now to create the second fat32 partition;
+n to create a new
+p for primary
+2 to create the second partition
+just press enter to start at the default sector
+then press enter once more to end at the default last sector
+t to enable type
+2 to select the second partition
+6 to set the type to fat
+a to make this partition active
+2 again for the second partition
+w to write the information to disk and exit
+
+```bash
+mkfs.exfat -n USB /dev/sdb1
+mkfs.vfat -F 32 -n BOOT /dev/sdb2
+```
+```bash
+grub-install --target=x86_64-efi --efi-directory=/media/user/BOOT/boot/efi --boot-directory=/media/user/BOOT/boot --force --removable --no-floppy
+```