I want to transfer data across from one HD to another, and I've got 2 hooked up at the moment. I find I can copy from the second HD to the current HD, but not the other way round. The "paste" command is dimmed out on the right-click menu. What is the reason for this?
1 Answers
As @kurja stated the reason is permissions. The solution is as follows:
1) Insure that the target filesystem is mounted rw (read/write) and if not, remount it
2) Locate the target directory and check it's permissions. I'm using my Documents directory as an example (replace the ~/Documents with the full path to your target and the second Documents with just the folder name:
ls -l ~/Documents/.. | grep Documents
drwxr-xr-x 10 me me 4096 Apr 3 10:43 Documents
3) Examine the permissions and insure that they are appropriate. (Note that a directory must have execute permissions for your user/group for you to even traverse it and write permissions for you to write to it.
4) Adjust these permissions as necessary to match the requirement for your user to be able to traverse (x) and write (W) into the directory you need to write to.
If anything in this answer is unclear please drop me a comment and I'll clarify to the best of my ability.

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cat /etc/fstab
andlsblk
are the two commands that will help us know your file system better, you've to paste these commands on by one in terminal. give us the output of these commands and then we can help you better, if you don't understand any of the terminology, feel free to comment – Sumeet Deshmukh Apr 06 '17 at 11:42