Thanks to all who responded...

I never knew Boot Camp Assistant could make bootable Windows flash drives! 
Yes, this did the right thing. Very nice.

Thanks!
-Carl


> On Jul 26, 2020, at 2:48 PM, Macs R We <[email protected]> wrote:
> 
> When I've had to do this, I usually just have the originator (e.g., MS Media 
> Creation Tool) write the file directly to the USB in the first place, 
> precisely to avoid issues like this.
> 
> You might try a "cloning" utility, such as Carbon Copy Cloner or the cloner 
> tool in Drive Genius.
> 
>> On Jul 25, 2020, at 9:25 PM, David Schwartz <[email protected]> wrote:
>> 
>> Maybe Roxio Toast would work.  
>> 
>> 
>> 
>> 
>>> On Jul 25, 2020, at 9:22 PM, Carl Hoefs <[email protected]> 
>>> wrote:
>>> 
>>> I just tried this command:
>>> 
>>> $ sudo dd if=Win10_2004_English_x64.iso of=/dev/rdisk2s1 bs=1m
>>> 
>>> It completes successfully, but the flash drive is rendered unreadable by 
>>> both macOS and Windows. I guess I'll have to give up and buy an el-cheapo 
>>> Win10 CD on eBay...
>>> 
>>> -Carl
>>> 
>>> 
>>> 
>>>> On Jul 25, 2020, at 6:15 PM, Carl Hoefs <[email protected]> 
>>>> wrote:
>>>> 
>>>> I am trying to write a .iso file to a USB flash drive to be used to 
>>>> install Windows 10 onto a PC with a blank HDD.
>>>> 
>>>> I've downloaded the 5.27GB 64bit Windows10.iso file (twice) from 
>>>> microsoft.com, but when I use DiskUtility.app to "restore" the .iso file 
>>>> to the flash drive (formatted as ExFAT & GUID), it always errors out with: 
>>>> "Could not validate source - invalid argument". It sounds like it's trying 
>>>> to parse the .iso file and can't (the .iso isn't corrupted). This is the 
>>>> behavior on both Mojave and Catalina.
>>>> 
>>>> Is there any other way I can do this on a Mac, or do I have to hunt down 
>>>> another Windows PC?
>>>> 
>>>> -Carl
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