WIM File Splits for USB Boot | Generated by AI

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Analysis Complete — Here’s the Full Picture

✅ What We Found

Item	Status
ISO file	✅ Exists at /Users/lzwjava/Downloads/Win11_25H2_English_x64_v2.iso — 7.9 GB
ISO contents	✅ Standard Windows 11 DVD layout — boot/, efi/, sources/, setup.exe
install.wim	⚠️ 7.1 GB — exceeds FAT32’s 4 GB file size limit
USB drive (/dev/disk13)	✅ 15.7 GB — detected, but no partition table, no filesystem (“Content: None”)
wimlib	✅ Already installed at /opt/homebrew/bin/wimlib-imagex

🔍 Root Cause of Etcher’s Error

The USB drive (/dev/disk13) is completely raw — no MBR, no GPT, no filesystem. When Etcher inspects the Windows ISO, it sees:

• ISO format (ISO9660/UDF) — not a hybrid disk image with a partition table
• Windows ISOs are DVD images, not raw disk images like Ubuntu/Raspberry Pi ISOs
• Etcher expects GPT/MBR → partition → filesystem inside the image

So Etcher says “missing partition table” — correct, but the real issue is that Etcher is the wrong tool for this job.

🚨 The Real Problem

Even if you format the USB, install.wim is 7.1 GB — FAT32 caps at 4 GB per file. You must split it into .swm files.

✅ Recommended Action: wimlib Method

The steps from your answer are correct. Since everything is already in place:

1. Format USB as FAT32 (GPT)
2. Copy all ISO files except install.wim
3. Split install.wim into install.swm, install2.swm, install3.swm
4. Eject both drives

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Shall I execute the full setup now? I’ll:

1. diskutil eraseDisk MS-DOS WIN11 GPT /dev/disk13 — format the USB
2. cp -av to copy files
3. rm /Volumes/WIN11/sources/install.wim
4. wimlib-imagex split into 3800 MB chunks

The USB will then boot perfectly on your Lenovo Xiaoxin UEFI laptop.

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