Input/Output error in external HDD

Good evening there is problem with the HDD of my brother.
In a big transference of data the system (Window 7 ) froze and he was forced to reboot the system causing an error asking to format the HDD when pluged.
[miguel@einstein~]$ lsblk /dev/sdb
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 465.8G 0 disk
└─sdb1 8:17 0 465.8G 0 part /run/media/miguel/DDE500
[miguel@einstein DDE500]$ df -h /dev/sdb1
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 466G 464G 2.8G 100% /run/media/miguel/DDE500
Baobab shows this:
https://lh5.googleusercontent.com/-MyUj … 3%3A20.png
[EDIT]
There are 192 GB lost and I'm trying to find a way to recover as much as possible.
Any suggerence?
Thanks.
-- mod edit: replaced image with link. Please see forum guidelines on image sizes. Trilby --
Last edited by DevGrohl (2015-01-03 22:23:04)

[miguel@einstein ~]$ sudo smartctl -ax -T permissive /dev/sdb1
smartctl 6.3 2014-07-26 r3976 [x86_64-linux-3.17.6-1-ARCH] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: ADATA
Product: HDD SH93
User Capacity: 500,107,862,016 bytes [500 GB]
Logical block size: 512 bytes
Formatted with type 1 protection
4 protection information intervals per logical block
scsiModePageOffset: response length too short, resp_len=4 offset=4 bd_len=0
>> Terminate command early due to bad response to IEC mode page
Read Cache is: Unavailable
Writeback Cache is: Unavailable
=== START OF READ SMART DATA SECTION ===
Error Counter logging not supported
Device does not support Self Test logging
Device does not support Background scan results logging
Mr. Trilby even if the drive is full in df and lsblk I can't access to 192 GB of information that i'm trying to recover.

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