Back in April, Microsoft updated the list of Windows 10 system requirements for the first time since the operating system's release in 2015. To run Windows 10 1903, the Windows maker raised the minimum storage capacity to 32GB. While Microsoft didn't officially give any explanation, we assumed it could be due to the newer version's Reserved Storage feature that sets aside 7GB of space for Windows updates and system cache.
However, in an updated advisory, the company says that the 32GB requirement doesn't apply to existing machines as anyone can update to Windows 10 May 2019 Update. The requirement is only for OEMs manufacturing new PCs.
"New disk space requirement for Windows 10, version 1903 applies only to OEMs for the manufacture of new PCs," the company writes in a new note (emphasis is ours).
"This new requirement does not apply to existing devices. PCs that don’t meet new device disk space requirements will continue to receive updates and the 1903 update will require about the same amount of free disk space as previous updates.
Microsoft does refer to the same Reserved Storage feature as a reason why it has raised the storage requirement to 32GB up from 16GB. The new devices will set aside disk space to be exclusively "used by updates, apps, temporary files, and system caches."
The company added that "Reserved storage will be enabled automatically on new PCs with Windows 10, version 1903 pre-installed, and for clean installs." This means that if you aren't doing a clean install, Windows 10 1903 won't enable the Reserved Storage feature automatically (more details here).
If this was a reason putting you off the latest version, you don't need to be worried. Along with other features, the latest update does finally bring the ability to pause updates (both feature and monthly) for up to 35 days.