External HDD cannot be mounted


I really have a problem with my HDD. I was working on it, it was my local HDD installed on a MacBook 2009 but some day my Mac turned off suddenly and it didn't work again.

I installed OS X on a new disk and tried to attach the other in an external case but the volume doesn't mount.

The now broken disk contained one visible volume and OS X 10.10 Yosemite was installed.

Here are the partition infos I can see:

arturoperez$ diskutil list

   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *250.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS New Mac                 99.5 GB    disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:                  Apple_HFS Datos                   149.6 GB   disk0s4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *159.3 GB   disk1
   1:                       0xEE                         159.3 GB   disk1s1

arturoperez$ diskutil info /dev/disk1s1

   Device Identifier:        disk1s1
   Device Node:              /dev/disk1s1
   Part of Whole:            disk1
   Device / Media Name:      Untitled 1

   Volume Name:              Not applicable (no file system)

   Mounted:                  Not applicable (no file system)

   File System:              None

   Partition Type:           0xEE
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported

   Total Size:               159.3 GB (159307878400 Bytes) (exactly 311148200 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        4096 Bytes

   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes

   Whole:                    No
   Internal:                 No

The output of sudo gpt -r show /dev/disk1 and sudo fdisk /dev/disk1:

arturoperez$ sudo gpt -r show /dev/disk1

     start      size  index  contents
         0         1         PMBR
         1  38893525         

arturoperez$ sudo fdisk /dev/disk1

Disk: /dev/disk1    geometry: 2421/255/63 [38893526 sectors]
Sector size: 4096 bytes
Signature: 0xAA55
         Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
1: EE 1023 254  63 - 1023 254  63 [         1 -  312581807] <Unknown ID>
2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
4: 00    0   0   0 -    0   0   0 [         0 -          0] unused

Apparently it doesn´t have an active partition but I tried by different ways to fix it and i couldn´t.

Is there anyone who can help me with this? I have important information there and I need to restore it asap.

Update 1

After trying to follow the instructions in klanomath's answer, I get this message when I try to create a new GPT.

arturoperez$ diskutil unmountDisk disk1
Unmount of all volumes on disk1 was successful
arturoperez$ sudo gpt -r show /dev/disk1
     start      size  index  contents
         0         1         PMBR
         1  38893525         
arturoperez$ sudo gpt create disk1
arturoperez$ sudo gpt add -b 40 -i 1 -s 409600 -t C12A7328-F81F-11D2-BA4B-00A0C93EC93B disk1
gpt add: disk1: error: no primary GPT header; run create or recover

Update 2

I tried to make an image with TestDisk, it took 3 days to finish… I changed the disk geometry and then I analyzed it again. This is the result:

TestDisk 7.0, Data Recovery Utility, April 2015
Christophe GRENIER <grenier@cgsecurity.org>

Disk /dev/disk1 - 160 GB / 149 GiB - CHS 19457 255 63

     Partition                  Start        End    Size in sectors
  1 P EFI System                    40     409639     409600 [EFI System Partiti
> 2 P Mac HFS                   409640  311312231  310902592 [Sin t ulo]
  3 P Mac Boot               311312232  312581767    1269536 [Recovery HD]

Now i'm stuck because i don't know what is the next step.

Best Answer

A good option is to try DiskWarrior:

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It may not be suitable depending on your original disk format but TestDisk can also recover damaged partitions:

TestDisk is powerful free data recovery software! It was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software: certain types of viruses or human error (such as accidentally deleting a Partition Table). Partition table recovery using TestDisk is really easy.