Get-FileHash -Path C:\path\to\windows8.1.iso -Algorithm SHA1 Matching the hash ensures the file is unaltered and safe.

| Parameter | Requirement / Detail | |-----------|----------------------| | Architecture | x64 | | File name | Typically en_windows_8_1_pro_x64_dvd_2971905.iso (varies by language/update) | | SHA-1 checksum (example) | 2845C768E9DFB79A6F55374AE2273780F8EB0BF1 (verify via official MSDN or VLSC) | | Size | Approx. 4.1–4.4 GB | | Installation type | Bootable ISO (UEFI or Legacy BIOS) |

Below is a comprehensive, citation-ready outline and content suitable for a short technical brief or informational paper. Acquisition and Validation of Windows 8.1 Pro (64-bit) ISO Image: A Technical Overview