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I just got a 3TB external drive. When I first plugged it in, it showed up as a 2.7TB drive (as expected). Whenever I get a new external device I like to format it (and admittedly, I succeeded initially with the simple right click format from My Computer) but I wanted to try something different. So I went into Computer Management and deleted the partition on the hard drive and the following came up:

Computer Management 1

So that's strange. What started as a single partition now became two blocks of unallocated space. I can only partitions in the first block:

Computer Management 2

I am also not able to extend the first partition. I created the partition as large as Windows would allow me.

How can I join these two unallocated spaces back together again?

I am using Windows 7 Professional, if that means anything special.

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+1 cause I like screenshots. – Doc Aug 9 '11 at 22:20
up vote 1 down vote accepted

What you need to do is format the drive as a GPT partition. What is happening is that you are being limited by the specifications of MBR. MBR < 2tb. Once you change the partitioning of the device you will be able to have one large drive. Get there by right clicking on the Disk 2 and change it from there. That way you don't need any third-party software.

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Already used GParted but this will be good to know in the future. Thanks. I've changed the accepted answer (sorry, Doc, this guy needs some more reputation anyway). – KPthunder Aug 11 '11 at 3:29

Can you not click on where it says "Disk 2" and do some kind of reinitialization there?

If not, a quickish solution I'd use is just burn GParted to a CD and use it to fix up your partitioning accordingly.

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No relevant options are available in that context menu. I'm thinking I did something that Windows can't see for some reason and therefore I will have to go with GParted. – KPthunder Aug 9 '11 at 22:22
KPthunder: If I knew a quick Windowsy solution, that'd probably end up being faster. But I never really learn such solutions for stuff like this cause I always end up finding a fast linuxy solution. GParted is AWESOME. – Doc Aug 9 '11 at 22:28
Yes, I like GParted as well. I just don't like shutting off my computer to use it. I'm about to go ahead and use GParted. If it's able to fix the disk I'll accept your answer. – KPthunder Aug 9 '11 at 22:35
It'll work, it's GParted!?!! Indeed rebooting is lame, but that's what you get for running Windows ;) – Doc Aug 9 '11 at 22:50
Well, it took a while (freaking graphics settings, man...) but it worked. I wonder what happened in the first place... When I started up Windows again it said that one of my USB devices had malfunctioned and wasn't recognized... but the drive appears to be working fine... – KPthunder Aug 9 '11 at 23:11

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