Because this is an OEM ESD, the image may include:
If you have an .esd file labeled as above, here is the professional deployment method. windows 10 x64 21h1 pro 3in1 oem esd ptbr junh
A full 3in1 WIM file from Microsoft would occupy ~6GB. The ESD version compresses this to approximately 3.2GB to 3.8GB. This fits perfectly on a standard 4GB USB flash drive formatted as FAT32 (which cannot hold files larger than 4GB). Because this is an OEM ESD, the image
Large Brazilian companies still running 21H1 due to internal software certification. The ESD format allows rapid network deployment via PXE or MDT (Microsoft Deployment Toolkit). The June 2021 build (JunH) ensures compatibility with SSL certificates and security baselines from that era. This fits perfectly on a standard 4GB USB
OEM versions in PTBR reduce deployment friction for resellers. The 3in1 structure allows a single USB stick to service different customer needs:
Companies that standardized on 21H1 before the Windows 11 transition may require this exact build to maintain hardware compatibility (older printers, industrial controllers, 32-bit legacy apps). The Pro edition provides Group Policy control to block telemetry and manage updates.