Seagate 3TB HDD Unalocated space

[RazorStorm]

I noticed both of my seagate 3TB barracuda are only showing 1.99TB of space usable and the other 750GB (ish) of space as unallocated. When i right click on the unallocated part of the drive in disk manage it shows most of the options grayed out but i can still click on property's. I have tried formatting the drive and searched google for a bit and couldn't find anything. I also tried seagate tools and it don't really do anything other then test the drive for failures. What do I do? they are not OS drives

[KamiKatze]

@RazorStorm

 

This is a known problem. It's due to a old formatting method. Use GPT instead of MBR.

 

Edit: right click on "Disk 2" and press "convert to GPT"

[Nineshadow]

It has to be a GPT drive, not an MBR drive. 

MBR is old and only supports up to 2TB.

 

You can do this :

• Open CMD
• diskpart
• list disk
• select disk <number of disk>
• convert gpt

 

However, you need to delete all partitions and volumes on the HDD in order to do so.

[RazorStorm]

Thanks guys, very helpful