Why don't you try to repartition that 1 tb ?
Click on the 1 TB APPLE HDD disk (not volume) and choose 1 partition then apply ?
If you read than you should know that's exactly what he is trying to do now.
ok. i did add the internal hdd in the system pref>spotlight>privacy>
...then i tried again. i tried to disk utility erase 'journal' the internal hd Volume and it popped up error again telling me that it could not unmount disk....
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Sorry for the somewhat late reply, I live in a different time zone.
The problem you can't do wipe or partition on the disk is that the disk is in use, that's why I said before to do the Spotlight Privacy thing.
Now, this did not work so there is/are some other things still going on, there are most likely files in use.
The easiest way around this problem seems to be to startup from a non working full system, what I mean with this, startup from an install disk or recovery, this uses no files on the disk and you should be able to wipe/partition it this time.
But, you can also do the following, you want to use the disk for files, why not just move everything to the trash, or better use terminal to remove all files on the disk.
The command for this is:
sudo rm -rf "path to folder/file"
Hit enter
Note: You may have to enter a password, the sudo command gives you root permissions and will delete everything.
"path to folder/file" without the quotes, you can just drag the folder on the terminal window, it will automatically add the path.
After -rf there needs to be a space.
If you do this will all the folders at the root level it is clean and you can then use it for files.
This way you don't need to erase anything.
Note: Be careful with what you do, this command WILL delete everything you point the path to
