Editing Windows Installation (section)

==== Copy the Windows 10 ISO to the USB flash drive ====

Mac OS doesn't read NTFS filesystem natively. This is why the USB drive is formatted using MS-DOS. However some files (e.g. `install.vim`) are too large to copy to MS-DOS. They need to be split and then copied over.

First copy all the files except the ones that are too large:

<pre>
$ rsync -vha --exclude=sources/install.wim /Volumes/CCCOMA_X64FRE_EN-US_DV9/* /Volumes/WIN10INST
</pre>

Again, the names of the volumes may be slightly different.

Now copy files that are over 4Gb. This requires `wimlib` which can be installed with homebrew.

<pre>
$ brew install wimlib
</pre>

Split the file(s) into 3800Mb parts in order to accommodate the MS-DOS limits.

<pre>
wimlib-imagex split /Volumes/CCCOMA_X64FRE_EN-US_DV9/sources/install.wim /Volumes/WIN10/sources/install.swm 3800
</pre>

Again, the paths to the source and destination directories may be slightly different.