In order to boot Windows PE directly from memory (also known as RAM disk boot), a contiguous portion of physical memory (RAM) which can hold the entire Windows PE (WIM) image must be available.(If you add drivers, packages, or apps, you'll need more memory.) The base version requires only 512MB of memory.You can run Windows PE entirely from memory. Windows PE has the same requirements as Windows with these exceptions:
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Windows PE runs the Windows command line environment, and supports these Windows features:
See Create bootable WinPE media for more information. You can boot WinPE from USB, CD/DVD/ISO, or a virtual hard drive. Prior to Windows 10, version 1809, WinPE was included in the ADK and wasn't an add-on.