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Mac-mini:~ darrellstall$ sudo gpt recover /dev/disk4
gpt recover: /dev/disk4: no primary or secondary GPT headers, can't recover

Mac-mini:~ darrellstall$ sudo fdisk /dev/disk4
Disk: /dev/disk4 geometry: 243201/255/63 [3907029152 sectors]
Signature: 0x0
Starting Ending
#: id cyl hd sec - cyl hd ...

Why can't I access drive?
Mac-mini:~ darrellstall$ sudo gpt recover /dev/disk4
Password:
gpt recover: unable to open device '/dev/disk4': Resource busy

From Terminal, diskutil list -
HD with problem is disk4, which has no GUID partition scheme listed nor EFI.

Mac-mini:~ darrellstall$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple ...

The external HD with missing GUID partition is 2TB, and the internal HD is 1TB with a 801.97 GB boot drive partition, and 197 GB Bootcamp partition (unmounted).
Disk Utility only shows the partition on the 2TB drive (2.VIDEO) without listing it within the physical disk, as compared to the internal ...

Is there a way to recover the GUID partition that is missing from my external HFS+ formatted HD?
I've installed TestDisk with home brew.
When I unzip the file, testdisk-7.0.mac_intel.tar.bz2, and click on the testdisk file, I'm able to list disks,
but I don't know where to go from there.

I ran TestDisk again after reformatting (repartitioning) drive.
This time, TestDisk recognizes the drive as EFI and gives me instruction that drive must not be mounted.

I unmounted drive with Disk Utility. It showed an EFI System and a Mac HFS partition. I ran Analyse on EFI, then entered p to ...

Yes, I have an Intel MacBook Pro 8,2, early 2011.
I don't know what EFI-GPT is.

What I'm trying to determine is if TestDisk can recover a drive directory after it is damaged.

I'm looking for a way to recover a corrupted directory, as this seems to happen occasionally because I move an external ...

Fiona, I ran TestDisk as Administrator and followed Step By Step instructions here -
http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step

I found my external drive in the log file and selected "Proceed".
TestDisk highlighted [None] Non-partitioned media, so I selected [Mac] Apple Partition Map ...

No thank you. You aren't helpful.

No thanks. I don't drink Pferdepisse Bier.