Solved: Can't Extend External HD Back to Full Size

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CthulhuCalamari

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I bought a 3tb drive to use as an external for my XP machine a while ago. Now I am trying to extend my 3tb drive back to its full size for use as an external with my 7 & 8.1 notebooks. (7's Boot Environment is BIOS.)

I've tried simply extending the size in Disk Management, but I get this message:

"Only the first 2TB are usable on large MBR disks. Cannot create partitions beyond the 2TB mark, nor convert the disk to dynamic."

I've also tried to extend it through the Command Prompt, and that didn't work either.

Any advice would be appreciated.
 

Oddba11

Jim
It's My Birthday!
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May 12, 2011
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Win7 doesn't use MBR for large discs, it uses GPT, thus the error you are getting.

Backup the data, delete the partition(s), create a new single partition, and format.

Also, anytime that you try to alter partition information, there is a chance of some/all of the data on the disc can be lost or corrupted. This can happen using Windows or dedicated partition software by beginners and veterans alike. You should always have a backup copy of all data you don't want to lose.
 

CthulhuCalamari

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Nov 21, 2011
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Thanks for that. I'm transferring the current data over now.

Will update once I give that a shot.
 

CthulhuCalamari

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Alright, so I've moved all of the data to another drive, and deleted the volume, and then I hit a roadblock, because there is no option to delete the partition. When I attempt to create a New Simple Volume there is no way to extend the volume. All right-click options on the unused partition are also grey'd out (besides Properties & Help), so there's no means of even using the other 1/3 of the drive as a separate partition, either.



Is there some other way around this?
 

texasbullet

Ramon
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Jun 11, 2014
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I think you need to click on the right partition (second partition) of your external drive and select delete partition or something like that.
 

CthulhuCalamari

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I've tried that, extending the newly formed partition, and the Format option from the My Computer menu. All to no avail:



 

managed

Allan
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In Disk Management delete the F volume then right click on the text 'Disk 1' on the left and you should see an option to 'Convert to GPT disk'. Do so then create partition(s) and format.
 
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