cgsecurity.org

This is on a Intel Mac.
I unplugged the drive from my Asus router after their Disk Utility feature had found problems with the drive. I plugged to my Intel Macbook Pro and ran the Apple Disk Utility and got this:
"partition map check failed because no slices were found"
So I heard about TestDisk. I downloaded it. When I open the file, it opens under the terminal utility. I accept to log record, then I get a message:
"write access for this media is not available" - TestDisk can only read but not write.
I chose the EFI option, it provides some information, but since it cannot write (make any changes to the drive). I don't know where to go from there. What is the next step? Should the software be able to write also, so it can repair??

Your disk is in read only mode because a partition from this disk is mounted by Mac OS X.
You need to umount this volume without ejecting the disk.

Ok I got through the scans, including deep scan. It is showing a ton of partitions it can't recover. Now it is asking me to choose between add partition, load backup (which I don't have) and change type. How should I proceed to try and fix my drive and recover the partition map the drive had?
Thanks

I got similar results when I had the sector size in testdisk set wrong. You might double check the sector size of your disk and set testdisk to match that.

So I was not supposed to get that? What is supposed to look like when is right?