If you and your family share a common computer and you would like to prevent other users from filling the internal hard disk with downloads, you can easily do so with individual user accounts. With individual user accounts, every member is allocated an area to save his/her data.
However, if you like to provide a limited amount of space on the hard disk to every user account, Windows can easily manage memory allocations. To do this, start Windows Explorer, click with the right mouse button on the icon of the hard disk for which you would like to set up memory allocations. Then select the command ‘Properties’ in the context menu, activate the tab for ‘Quota’ in the following dialogue and select ‘Show quota settings’. For this, you require administrator rights so must either be using an elevated account or provide the appropriate password when prompted.