Data Recovery external hard drive - Stellar Phoenix or Disk Drill?

Question

Hi guys
This might not be the right location for my post, sorry, but I didn't know where to put it elsewhere.
This is the situation: My Finder keeps telling me that copying a huge folder to my My Book Studio Edition II is imposible, so I tried to reconfiger the external hard drive. Result: all my data is lost on that one (stupid me, indeed )
Luckily, I have another external HD with a back-up from the 1st of july, and the most recent files are on my computer. Only some folders an files are lost, or not up-to-date anymore, since I stored them on the external hard drive without making a back-up on the other external HD.
Google told me that Stellar Phoenix and Disk Drill can help, and indeed, Stellar Phoenix already showed me the map structure I had on my My Book Studio Edition II before completely erasing it, and this after only having scanned less than 5 %, but before continuing, I wonder if this software (and Disk Drill) are reliable, and they won't do anything bad to me beloved MacBook Pro
Thanks for your opinion!
Bob

Answer 1

Apparently, I found the solution.
Doing the below procedure I was able to access the files and copy all the content of My Documents.
To resolve this issue, you must turn off Simple File Sharing, and then take ownership of the folder:
Turn off Simple File Sharing:
Click Start, and then click My Computer.
On the Tools menu, click Folder Options, and then click the View tab.
Under Advanced Settings, click to clear the Use simple file sharing (Recommended) check box, and then click OK.
Right-click the folder that you want to take ownership of, and then click Properties.
Click the Security tab, and then click OK on the Security message, if one appears.
Click Advanced, and then click the Owner tab.
In the Name list, click your user name, Administrator if you are logged in as Administrator, or click the Administrators group.
If you want to take ownership of the contents of that folder, click to select the Replace owner on subcontainers and objects check box.
Click OK.
You may receive the following error message, where Folderis the name of the folder that you want to take ownership of:You do not have permission to read the contents of directory Folder. Do you want to replace the directory permissions with permissions granting you Full Control? All permissions will be replaced if you press Yes.
Click Yes.
Click OK, and then reapply the permissions and security settings that you want for the folder and the folder contents.
Disclaimer: Not my idea, but I learned from this page:
http://support.microsoft.com/kb/810881/en-us