When to open CD drive?

For reasons that are unclear SOME PCs when installing or upgrading from a DVD or usb flash drive DO need the DVD or usb flash drive to be ejected after the install files have been copied and the PC reboots, OR ELSE they reboot the usb flash drive or DVd and start all over again.

The install environment is supposed to boot to hard drive second time but does not always work properly. Ejecting the removeable drive as it boots for the first time usually sorts this issue.

I know this is true as one of my PCs always exhibits this behaviour, and I have seen others occasionally show the same issue.

I have concluded it must be something in the bios that causes this behaviour, but no idea what.

Fafhrd said:

If performing an upgrade, as the OP said he was, then you must start the Setup from within the running OS you wish to upgrade from.

So it is booting from the HD in the first place.

There is no boot from the DVD involved, so no need to set the BIOS to boot from DVD - do nothing and leave the first boot device as the hard drive.

Ergo, no need to remove the DVD, or conversely, no need to leave in after first reboot either.

For even quicker installation of the first (copying files) phase of upgrade, so long as you have enough disk space , copy the \sources folder to the hard drive you are performing the upgrade on, remove the DVD, and run setup.exe from the \sources folder on the hard drive.

True for an upgrade - but many do a clean install out of preference. I did not make that clear.

Edwin said:

I remember with Windows 7, if you didn't yank the usb stick out at first reboot, it could have started the installation process over again.
I don't think that's the case with W10.
Could depend on the machine.

It does happen for a clean install on some PCs as I said earlier.

Happens on one of my laptops. Pretty sure it is related to bios.