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3tb hard drive showing only as 2tb?


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7 replies to this topic

#1 mystic12

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Posted 18 April 2018 - 10:53 AM

Hey guys, this 3tb hard drive in a Dell 690 Precision pc is showing as only 2tb in explorer view:

 

https://s17.postimg.cc/j5t7vqjzj/disk3.jpg

 

In disk management it is showing the total size:

 

https://s17.postimg.cc/pjiaz29gv/disk.jpg

 

I tried right-clicking on the Unallocated but everything is shaded out, how can I delete that partition so the drive will show as 3tb please?

 

https://s17.postimg.cc/oh84gngen/disk2.jpg



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#2 JohnC_21

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Posted 18 April 2018 - 11:06 AM

It's because the disk is formatted with a MBR partition table and not GPT. Click on the box that says Disk 1. Right click the box and select properties. Under the Volume tabe it should say the disk has a partition style of MBR.  I have no idea why there is a System Reserved partition on Disk 1. If you detach disk 1 does the computer still boot to Windows? If yes, then download Partition Wizard, delete the System Reserved Partition on Disk 1. Convert the disk to GPT but back up any data on F: first. After converting to GPT ressize partition F: to use the entire disk using Partition Wizard.

 

Windows may be able to convert to GPT by right clicking the Disk 1 box but I would stick with Partition Wizard.

 

Edit: A MBR partition table only allows a maximum disk size of 2TB. 


Edited by JohnC_21, 18 April 2018 - 11:08 AM.


#3 mystic12

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Posted 18 April 2018 - 11:11 AM

Would using cmd prompt and diskpart to convert to gpt work from inside windows or from bootable flash drive?


Edited by mystic12, 18 April 2018 - 11:12 AM.


#4 JohnC_21

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Posted 18 April 2018 - 11:19 AM

No, Microsoft has a utility called MBRtoGPT but this only works on a System disk which the 3TB is not. In any case you should always back up the data on F: before attempting a conversion even though Partition Wizard says it can be done. Partition Wizard can do it but not on System Disks. That is why I asked if detaching disk 1 would prevent the computer from booting. You could try a conversion with the System Reserved Partition intact on Disk 1 and see what happens. It would either work or not. If not then you would need to do the conversion without the System Reserved Partition. If there is no data on the drive then you could use diskpart to create a GPT disk and format is as NTFS. 



#5 mystic12

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Posted 18 April 2018 - 11:25 AM

. If there is no data on the drive then you could use diskpart to create a GPT disk and format is as NTFS. 

Yes, there inst' anything on the 3tb drive, the owner only wants to use it to store data in the future. So can I use CMD from inside windows on the C drive?



#6 JohnC_21

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Posted 18 April 2018 - 11:41 AM

Yes, you would use diskpart. At an elevated command prompt type

 

diskpart

list disk

select disk X       X being the disk number of the 3TB drive. Make sure you have the correct number

clean                   Wipes the partition table

convert gpt

create partition primary

format fs=ntfs quick    This may take some time. What for the prompt.

assign

 

exit

 

Make sure the computer boots with Disk 1 detached. If it boots, then attach the drive and to the above commands.


Edited by JohnC_21, 18 April 2018 - 11:42 AM.


#7 mystic12

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Posted 18 April 2018 - 12:00 PM

Works now, thanks!



#8 JohnC_21

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Posted 18 April 2018 - 12:00 PM

No Problem, glad it's sorted out.






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