thanks for your help ! It works !!!!! Oh ,I am so excitement !! Thank you,
These was what I do :
At first I type " mount -t vfat /dev/sda1 /mnt/flashstorage"
It's reply was "can't find medium"
so I changed a parameter by using sda2 ,but It's reply still not change ,So ,I thought may be it's port have some problem . Then I took it down and changed a port and tryed again,
When I typed "mount -t vfat /dev/sda1 /mnt/flashstorage" It's reply was "mount: wrong fs type, bad option, bad superblock on /dev/sda1,
or too many mounted file systems "
So, I changed parameter again ,
As I have 4 USB port ,so ,this time I typed sda4, haha !!! It works !!
So, Thank you very much !!
I am chinese,and I am a student.My english is poor,but I think I will do it well.So help me please!