输入fdisk -l dev/sda 显示：dev/sda1 * 1 13 104391 83 linux dev/sda2 14 1044 4088542+ 8e linux LVM 然后我mount –t vfat /dev/sda2 /mnt提示/dev/sda2 already mounted or /mnt busy挂不上，怎么回事？谢谢啊