Computer HDD

[Mystik]

Nope, it's part of the 2012 agreement.
Still Hitachi factory, just renamed Toshiba.
European directive, etc...

Didn't Toshiba acquire Hitachi's 3.5" business? :P
Sure, they are manufactured in plants previously owned by Hitachi, but the design is Toshiba's, I believe.

i just say to u i formatted it, still 150, delated partions,s till 150, install it as GPT, still 150, btw it is a HITACHI and see it like a toshiba

Okay, now these:

What is the exact model of the HDD?
Which OS are you using?
Can you list some of your other specs, like Motherboard and CPU?
When you see the drive in Disk Management, what does the capacity say on the left? (Please screenshot if possible)

And I'd add to the list: Where did you buy the drive from? A reputable reseller?

Please take a screenshot of how the HDD looks in Disk Management:
Control Panel -> System and Security -> Under "Administrative Tools", choose Create and format hard disk partitions.
Or optionally type "Create and format" in Windows start menu's search and it should find it. (If your Windows is in another language then english, you have to type what it could be in your language)

When you get there, you should see all of your drives. Here you can screenshot what it says on the left, it should show the real capacity of the drive.

Or do what Chucky said, and try CrystalDiskInfo and please SCREENSHOT what it shows to you about the drive. (Blur out serial number if possible)
This way we might be able to HELP you.