Win 10 1903 -> 1909 upgrade strangeness...

  1. Posts : 82
    Windows10 Pro

    Win 10 1903 -> 1909 upgrade strangeness...

    Hi Guys,

    I'm usually the sort of person that watches and waits when a new upgrade comes out, but this time I went for it as soon as 1909 became available. I currently have/had three PCs running Windows 10 1903...

    Yesterday I upgraded two of the three PCs (both running Win 10 Pro 64-bit 1903), by downloading the 1909 Media Creation Tool (MCT) and running it on each machine, selecting the "Upgrade this PC now" option.

    All went well and after a few reboots, and around 30 minutes later, both systems are running fine (aside from a few required tweaks to the fonts sizes, and various explorer "View" settings).

    This morning I thought I'd also upgrade the third PC. Prior to the upgrade I manually ran Windows Update and lo and behold, the "Feature update to Windows 10, version 1909" was present, so rather than using the MCT, I thought I'd let Windows Update handle the upgrade. It was all complete in about 5 minutes, which left me scratching my head a bit - why does the MCT upgrade take so long?

    I also looked at the disk usage on all three systems after the upgrade to 1909...

    On the two I upgraded via the MCT, the disk usage had actually dropped approximately 23GB (1903) to 17GB (1909) - not sure where the extra 6GB has gone!

    On the other system that upgraded to 1909 via Windows Update, the disk usage hadn't changed - still at 23GB.

    I checked the current version of Windows 10 on all three systems and they all show 1909, with OS Build 18363.476

    My question is, why does the MCT upgrade take so long and why does it free up and extra 6GB of disk space?

    Any extra curiosity is that I'm currently (as I type) running the MCT upgrade on the third PC (even though it's supposed already upgraded) and it never complained that the system is already running 1909 / 18363.476.... Go figure...


      My Computer

  2. Posts : 7,441
    Windows 10 Pro 64 bit

    The update to 1909 cleans out previous interim updates which can hog space if you had been on the older version for some time. Use Disk Clean in admin mode and Wise Disk Cleaner to recover space. You can also delete any update files in C:\Windows\servicing\LCU

    When updating via Windows Update many files needed for v1909 already exist on the PC. When using the MCT you are effectively doing a full repair install which may take longer. The update is obviously much faster on PCs having a SSD.
      My Computers


  Related Discussions
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 18:13.
Find Us

Windows 10 Forums