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Windows 7: Unable to Create Partition / Install to Unallocated Space on HDD

23 Feb 2012   #1

Windows 7 Home Premium 64 Bit
Unable to Create Partition / Install to Unallocated Space on HDD

I have just built my first PC, and I am getting ready to install Windows 7 64 bit. When I select "Custom Install", I get an error stating that Windows can't be installed to the HDD. I have one Seagate 500GB drive installed that displays as "Disk 0 Unallocated Space" with 465 GB available. I have also tried to create a partition using DiskPart, but I get an "I/O device error" that won't allow me to create a partition.

I am using an ASRock Z68 Pro3 Gen3 with the HDD set to AHCI. Any ideas?

My System SpecsSystem Spec
23 Feb 2012   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

Has this hard drive ever had anything on it?

Has it ever been formatted?

Go into Windows Disk Management and do a refresh and rescan from the menu.

Try to format it and assign a drive letter in Disk Management. You will probably have to right click the unallocated space.

Then post a picture of what you see in Disk Management.
My System SpecsSystem Spec
23 Feb 2012   #3

Windows 7 Home Premium 64 Bit

I found the solution, I had to switch the DVD drive from AHCI to UEFI. Now the install works fine.
My System SpecsSystem Spec


 Unable to Create Partition / Install to Unallocated Space on HDD

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