External Hard Drive detected yet unable to be mounted

[chuchu6238]

I have been using Sony 16GB USB Hard Drive for 2 years...recently, one of my friend accidentally forget to ejected it from an PC... Therefore when I plug-in to my Mac Pro... it's undetectable at the Finder. Then, when I use Disk Utility, I'm able to detect it...but here come the problem...I can't repair it or verify it ..here's what it shown on my screen...

Sony Storage Media Media
Type : Disk

Partition Map Scheme : Unformatted
Disk Identifier : disk6
Writable : No
Ejectable : No
Location : External
Total Capacity : 0 Bytes
Disk Number : 6
Partition Number : 0

Disk Description : Sony Storage Media Media
Total Capacity : 16.04 GB (16,039,018,496 Bytes)
Connection Bus : USB
Write Status : Read/Write
Connection Type : External
S.M.A.R.T. Status : Not Supported
What does it mean?
What should I do?

 

[MacDawg]

You might want to try DiskWarrior

 

[spinnerlys]

...

Sony Storage Media Media
Type : Disk

Partition Map Scheme : Unformatted
Disk Identifier : disk6
Writable : No
Ejectable : No
Location : External
Total Capacity : 0 Bytes
Disk Number : 6
Partition Number : 0

Disk Description : Sony Storage Media Media
Total Capacity : 16.04 GB (16,039,018,496 Bytes)
Connection Bus : USB
Write Status : Read/Write
Connection Type : External
S.M.A.R.T. Status : Not Supported
What does it mean?
What should I do?

It's unformatted, possibly meaning the partition table is corrupt.

To repair that, you can use Gparted Live CD.