I have already installed ubuntu on my HDD which was a partition of Windows 10 before.
And such a case, all parttions was lost and after reading many suggestion on Internet, I choose Testdisk to recover the lost partition.
Hopefully, after a quick operation with testdisk I can see all file I lost  show up on the terminal of testdisk. And I hope I could copy It to 
my media (external drive). But I can see my external as a destination show up on the terminal. Maybe I missed some steps.
thank you for your kindly help
Ps: Sorry I am not good at English.
			
			
									
						
										
						External hard disk does not show up for copying revised file
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	When asking for technical support:
- Search for posts on the same topic before posting a new question.
- Give clear, specific information in the title of your post.
- Include as many details as you can, MOST POSTS WILL GET ONLY ONE OR TWO ANSWERS.
- Post a follow up with a "Thank you" or "This worked!"
- When you learn something, use that knowledge to HELP ANOTHER USER LATER.
Before posting, please read https://www.cgsecurity.org/testdisk.pdf
- cgrenier
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Re: External hard disk does not show up for copying revised file
Using the file explorer or equivalent, access / mount your external disk.
Under Linux, file system from external disk may be available in a /media, /mnt or /run/media sub-directory.
			
			
									
						
										
						Under Linux, file system from external disk may be available in a /media, /mnt or /run/media sub-directory.