That's is not true. I do Windows deployment and I know exactly how much space is needed.
Windows doesn't just magically grow by 30GB either. It grows because you've put files on the drive, if you say no then my guess is your laptop is OEM with bloatware on it.
By OEM I assume you mean using the factory Install. Which isn't the case. I reformat every OEM computer I get. There is no bloatware on it. In fact it hasn't even been installed all that long, I reformatted this machine back in June.
The Widows folder alone on this laptop alone is 26GB. Another 6GB for hyberfil, and 4GB for pagefile(which is only that small because I manually set it, if I left it on auto it would be 16GB, because Windows like use uselessly big page files). Microsoft Office is another 2GB(including MSOcache). Adobe CS Suite is another 7GB. Oh and another 5.6GB for the Windows 10 pre-load files. I've got a few other small programs installed(Filezilla Client, O&O Defrag, Daemon Tools Lite, Classic Shell, Kodi, Notepad++, and Filezilla) but that's it. I've got no documents on this computer(except 3 work related excel spread sheets on the desktop), no pictures, no movies, no media or data files at all actually. Just Windows and a few programs I use.
Can I go through and manually trim some of this down? Sure, but Disk Cleanup won't do it automatically. I could manually delete the MSOcache folder, I know that is safe because I'm a computer tech. I could delete the Windows 10 pre-load files, Disk Cleanup will actually do this, but you have to uninstall the update related to it before it will show up to be deleted in Disk Cleanup. And how many average users know this?
But more to the point, if I had a 64GB SSD, and it was setup up as just the system drive in the OP's computer, there would be no way I could install any games on it. Heck, I'd be close to limit to just install some other programs. So I'd have to install them on the HDD. And a good half of the SSD would go to waste on Windows related files that I'll likely never use. WinSxS goes largely unused, but is one of the largest space hogs, same thing with the Installers folder. In fact both of those folders are almost never used, but are the two biggest folders in the Windows directory. Why waste SSD space on them? That is the beauty of using the SSD has a cache instead of an independent system drive. The caching algorithm recognizes files aren't being used, and other files are used more often, and puts the files used more often on the SSD and leaves the files used less often on the HDD. That is why I suggest an SSD 64GB or smaller should be used as a Cache drive. Yeah, if you have a 128GB SSD, use it as your system drive(I do on my laptop), but 64GB is better used as a Cache.
All of which can be dumped with Disk Cleanup.
Saddly that isn't entirely true. Nothing automatic will get rid of the install files left in the Installer folder. The Disk Cleanup usually clears a couple hundred MB of Windows Update Cleanup, but nothing substantial. The WinSxS and Installers folders in Windows just grow the more you use the system.
