Something is eating up my USB Device!

Story Master 20 Reputation points

To clarify: I am using WinToUSB tool to install Windows on a USB Drive, Here, I have installed Windows 10 1511 on a 32GB USB Drive using WinToUSB.

After a few days of this, it ran just fine, but after install 4 GB of my needed programs, it used more than what it should. After checking the settings, it turns out that the "System & Reserved" is using 11 GB's in my USB Drive, and the apps and the games is using 7.? GB's of space, so how can I free up my C: drive when using Windows 10 1511 on a USB?

P.,S. I am already aware that Windows 10 1511's support already ended nearly half a decade ago, but I am comfortable using it, and I find it faster and sufficient

despite it's obsolete and old, however makes me travel in time!

(from my Microsoft Community Post)!

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Accepted answer
  1. Karlie Weng 14,951 Reputation points Microsoft Vendor


    First, begin with a cleanup:

    1. Open File Explorer.
    2. Right-click on Local Disk C: and choose Properties.
    3. Under the General tab, select Disk Cleanup.
    4. Click on Clean up system files.
    5. Choose the files you wish to remove, such as Windows Update Cleanup, log files, and downloaded program files.
    6. Click OK, then Delete Files.

    If this does not resolve your issue, identify the largest file, inform us, or conduct a search to learn more about that file.


    If the Answer is helpful, please click "Accept Answer" and upvote it.

    1 person found this answer helpful.

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  1. S.Sengupta 15,756 Reputation points MVP

    When you install Windows 10 using WinToUSB on a USB drive, the operating system runs entirely on the USB drive, not your C drive. Therefore, the storage space used by the OS and programs will be on the USB drive, not your C drive.

    1 person found this answer helpful.