Solved Unable to Create Partition / Install to Unallocated Space on HDD

[Synkro]

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?

 

[ignatzatsonic]

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.

 

[Synkro]

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