From win 8 to win 7, deleted disks, now unallocated disk space is not created in the disk, why?

Question

Windows

When installing windows 7, I deleted all hard drive partitions, free disk space appeared, I try to create partitions - nothing happens?

Answer 1

You start the installation, you reach the partition selection, press Shift F10, you get into the console.
diskpart
sel dis 0
clean
convert gpt
exit
exit
Then you update the disks and set the seven, during the installation process it will make MBR, so if the disk is more than 2TB, then it's better to put it on gpt.