sha256sum windows_8.1_x64.iso If the hash matches the official one, the file is verified (untouched, no malware injected). If it does not match, delete immediately.
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Instead, satisfy your curiosity with real, verified ISOs of Windows 8.1, 7, or even 95. Use the checksum techniques above to stay safe. And remember—the best way to verify a download is to go straight to the source: Microsoft itself. sha256sum windows_8