How to do if you upgrade Win10 system space is not enough

                                                                                                                                                                                         During the installation and upgrade process of Windows 10, Microsoft specially added a clever link. When the upgrade program detects that the system disk does not have enough free space, in addition to reminding the user to manually clean up the space, it also provides two additional options for the user to choose:
Select A• Insert a USB stick to get extra space, but it must be 16GB or more;
Select B• Choose another partition or link an external hard drive to get extra space (9GB or more);
Of course It is most convenient to choose to use a USB flash drive. What? No U disk? Go buy one, or plug in your mobile phone card with a card reader!


Users who use Ultrabook, 64GB Surface Pro 3, etc. can upgrade Win10 with confidence. Preparing a big USB flash drive is your first choice.