Page 967 - Windows 10 May 2019 Update The Missing Manual: The Book That Should Have Been in the Box
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It shows you a list of the partitions on your hard drive (Figure A-1, bottom).
Unless you’ve set up your hard drive for dual booting as described in the
box below, you probably have only one.
Select the name of the partition (or choose some unallocated space) on
which you want to install Windows, and then hit Next. If you see a “Drive
options (advanced)” link at the bottom of this window, you can use it to
delete, create, or format partitions. To create a dual-boot situation, you have
to erase a partition completely to make it ready for Windows 10.
After the formatting process is complete, click Next.
The Setup program begins copying files to the partition you selected and,
eventually, restarts the computer a time or two.

