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→Steps to follow before installing a new OS on DELL Precision 3630 boxes
# Boot Windows 10 and shrink the Windows partition using any disk utility ([https://www.isunshare.com/windows-10/7-ways-to-open-disk-management-in-windows-10.html Windows 10 Open Disk Management] recommended).
# Access the [https://www.howtogeek.com/56958/htg-explains-how-uefi-will-replace-the-bios/ UEFI settings] by pressing ''' F12 ''' right after booting. Go to ''' Sata Operations ''' and select ''' [https://en.wikipedia.org/wiki/Advanced_Host_Controller_Interface AHCI]'''.
# Install new OS.
=== Important ===
Switching to ''' AHCI ''' will prevent the machine from being able to boot Windows 10, so make sure you switch to AHCI ''' only ''' when you are ready to install the new OS.