Windows 10: Partition on hard drive is Unallocated after transfer to new computer

Recently purchased a new computer, moved my old 4 TB hard drive from my Windows 7 PC over to the new Win10 computer. New computer reads the first 2 TB partition on the hard drive fine, but the other 2 TB partition is missing on my This PC page and when I check the drive in Disk Management it is showing up as Unallocated. What would be the cause of this? Am I able to recover the partition, or should I try to extract the data from it using a third party software?

submitted by /u/Julford
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:)

 

W7 Hard drive partition issue

to get rid of that 100 meg windows partition that setup creates for you on a new install on a blank hdd:

- press shift+f10 when on the partition management screen in setup <-- this opens a command prompt
- diskpart <-- start the windows command line partition management tool
- list disk <--- list the installed hdds in this computer for the next step
- select disk 0 <- might have to replace 0 with the number of the correct disk
- clean <-- this will erase all data on the disk you selected one step up- dont use the wrong disk!
- create partition primary <- creates a primary partition taking up all space on the drive, adjust the command if necessary
- exit, exit to exit diskpart and the command prompt
- click refresh in partition manager and select your newly created partition and install to that

 

hard partition

Hi Prasad,

Thank you for posting in Microsoft Community.

I understand that you are trying to extend the Volume of Drives and create partitions from C: drive.

I would suggest you to follow the steps and check if it helps you.

• Press Windows + R keys, type diskmgmt.msc hit
  enter.
• Disk management will open. Right click on the C: drive
  below in the segments of the partitions.
• Select Shrink Volume. Select the Amount of space
  you want to extend in MBs (1GB = 1024MB).
• Follow the instruction and check if it creates a Unallocated Drive.

Later after the Unallocated drive is created follow the below steps to crate a partition.

• Right click on the Unallocated drive and select
  New Simple Volume.
• Select the Drive letter and follow the instructions and check if it
  creates a partition.
• Follow the same to Create partition.

Note: C: drive must be not less than 100GB if you are using a 1TB hard drive. partitions must not be more than 3 drives to have a better functioning of the system.

Keep us posted to help you better.

 

Partition My Hard Drive

1. Right click on the space listed as unallocated.
2. At the menu that comes up, click on the New Partition option.
3. You will now be presented with a wizard as to how you would like the partition to be created. At the first screen press Next.
4. At the following screen, determine if you need a primary or extended partition. For more information about these partitions you can read our partition tutorial listed above. Most people will be fine selecting Primary Partition. Select Primary Partition and press Next.
5. You will be prompted to type in how much of the unallocated space you would like used for the new partition. In my example, my unallocated space is 26.43 GB, so I can choose to make a partition of that entire amount of only use half and save the rest for another partition. Regardless, of what you decide, you need to enter a size in the Partition size in MB: field, or stick with the default size, and press the Next button.
6. At the next screen, select the drive letter you would like assigned to it, or use the default one given. When done, press the Next button. The drive letter that you assign here will be how you access the partition later.
7. For the most part you are advised to use the NTFS file system. If you need a file system that can be readable by older operating systems like DOS, Windows 95, Windows 98, or Windows ME, then you should instead choose the FAT32 file system.
8. Type a name in the Volume Label field that will be associated with this partition or leave it blank.
9. Finally press the Next button and you will come to a summary screen. Review how the partition will be created, and if you are satisfied, press the Finish button to complete the creation and formatting of your new hard disk partition.