Recovering my DATA from USB External HD

I have problem because my External USB Hard Disk, I can't repair my HD and I can't extract my data/files.

check the info of the Hard Disk

diskutil info /dev/disk2s2

Device Identifier: disk2s2

Device Node: /dev/disk2s2

Whole: No

Part of Whole: disk2

Volume Name: ADATAHD

Mounted: Yes

Mount Point: /Volumes/ADATAHD

Partition Type: Apple_HFS

File System Personality: Journaled HFS+

Type (Bundle): hfs

Name (User Visible): Mac OS Extended (Journaled)

Journal: Journal size 81920 KB at offset 0x3410001000

Owners: Disabled

OS Can Be Installed: No

Media Type: Generic

Protocol: USB

SMART Status: Not Supported

Volume UUID: 3A0FE0A0-1B83-3142-BC3A-97690E712867

Disk / Partition UUID: 8B32B8BE-35B8-41B8-B5D5-E219EEBBD14D

Disk Size: 999.9 GB (999860912128 Bytes) (exactly 1952853344 512-Byte-Units)

Device Block Size: 512 Bytes

Volume Total Space: 999.9 GB (999860912128 Bytes) (exactly 1952853344 512-Byte-Units)

Volume Used Space: 349.4 GB (349353291776 Bytes) (exactly 682330648 512-Byte-Units) (34.9%)

Volume Available Space: 650.5 GB (650507620352 Bytes) (exactly 1270522696 512-Byte-Units) (65.1%)

Allocation Block Size: 4096 Bytes

Read-Only Media: No

Read-Only Volume: No

Device Location: External

Removable Media: Fixed

verifyVolume first

diskutil verifyVolume /dev/disk2s2

Started file system verification on disk2s2 ADATAHD

Verifying file system

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

The volume ADATAHD could not be verified completely

File system check exit code is 8

Error: -69845: File system verify or repair failed

Underlying error: 8: Exec format error

repairVolume command

diskutil repairVolume /dev/disk2s2

Started file system repair on disk2s2

Repairing file system

File system check exit code is 8

Updating boot support partitions for the volume as required

Error: -69610: Error parsing fsck program XML format output

Underlying error: 8: Exec format error

Using fsck_hfs command

sudo fsck_hfs -fryd /dev/disk2s2

Password:

journal_replay(/dev/disk2s2) returned 16

** /dev/rdisk2s2

Using cacheBlockSize=32K cacheTotalBlock=32768 cacheSize=1048576K.

Executing fsck_hfs (version hfs-366.70.1).

could not get volume block 2, err 16

could not get alternate volume header at 1952853342, err 16

volumeType is 0

DELETED CHARACTERS

unknown volume type

primary MDB is at block 0 0x00

alternate MDB is at block 0 0x00

primary VHB is at block 0 0x00

alternate VHB is at block 0 0x00

sector size = 512 0x200

VolumeObject flags = 0x01

total sectors for volume = 1952853344 0x74662d60

total sectors for embedded volume = 0 0x00

CheckForClean - unknown volume type

CheckHFS returned 6, fsmodified = 0

I was trying this with gpt disk2

sudo gpt -r show disk0

Password:

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 235298960 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

235708600 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

236978136 7

236978143 32 Sec GPT table

236978175 1 Sec GPT header

$ sudo gpt -r show disk2

gpt show: unable to open device 'disk2': Resource busy

$

using `repairDisk`

$ diskutil repairDisk disk2

Repairing the partition map might erase disk2s1, proceed? (y/N) y

Started partition map repair on disk2

Checking prerequisites

Problems were encountered during repair of the partition map

Error: -69808: Some information was unavailable during an internal lookup

$

Please tell me about some method to Extract Data/Files and Repair my External USB Hard Disk