thanks to Ted Zieglar
 

Hi, Ted Zieglar
I'm sorry why I can't send this letter for a long time by using reply.
Thank you very much give me the reply. It's a great helping for me. I'm
sorry not to describe the questions clearly. Yes, I wrote 'disk partial'
just means it was partition. My removable disk has two partitions, one
partition is unreadable, I had formatted it and I had written some data on
it. But now it displayed unformatted and I can't read it. The other
partition is readable, but one folder on it is unreadable.