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  • Likely, it's safe... but first, I'd make an image of the whole USB drive, in case there is already some data on the remaining 32 GB of supposedly free space. e.g. with imageusb.en.softonic.com or any drive imaging tool. Commented Feb 7 at 17:27
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    Overarching answer: no, as it's a read-only scenario (WinPE is booted and OS partition restored via Dism from a WIM/OS drive restored via a FFU). Caveat is whether additional partitions can be created on Windows and whether it will recognize any partitions after the first, hanging on what version of Windows used - while Win11 supports multiple partitions on a USB drive, I don't believe Win ≤10 does (could be wrong, as support for this was added in Win11, not sure if it was ported backwards). If not supported, any partitions after the first would not be accessible natively within Windows.
    – JW0914
    Commented Feb 27 at 14:03