I'm not a multi-boot Flash Drive person...years ago I had a CD wallet full of scan and rescue Disks but since switching to Linux I don't need them.
I was watching a youtube video on Ventoy...of which there are many...so I gave it a try. Once Ventoy was installed on my Sandisk 16GB Flash Drive...I selected my ISOs and dragged them across which did take some time being 5.9GB.
When writing the ISOs was complete I safely removed the Flash Drive...turned off the computer and re-booted to the Ventoy Flash Drive...
I selected Mint 21.1 but it wouldn't boot got errors...Mint 20.3 wouldn't either. The only one to boot was Foxclone but why ?
I changed to a 16GB Lexar Flash Drive...installed Ventoy and dragged in the same ISOs...when done I clicked safely remove drive...I noticed the red light flashing on the drive which means Data is still being written to the Flash Drive.
So I waited 3 to 4 minutes...the red light was out so I removed it then re-booted in to Ventoy and all the ISOs now boot. I then re-installed Ventoy to my Sandisk 16GB Flash Drive and dragged the same ISOs to it...after clicking safely remove drive...I opened Disks and saw this...
The Flash Drive is still being written to...that's why the ISOs wouldn't boot and seems to be a Ventoy thing because I dragged the same ISOs on to an empty Sandisk 16GB Flash Drive and when finished that was it...I could remove it.
Back in the Day Fat32 meant you couldn't copy files larger than 4GB but here's 5.9GB of ISOs being copied to a Sandisk 16GB Flash Drive Fat32 as shown here with no Ventoy on it...
Times have changed...I was going to but a few Lexar Flash Drives but their no longer made and haven't since 2018...didn't know that...anyway I hope this helps someone as it drove me mad for several days.
I was watching a youtube video on Ventoy...of which there are many...so I gave it a try. Once Ventoy was installed on my Sandisk 16GB Flash Drive...I selected my ISOs and dragged them across which did take some time being 5.9GB.
When writing the ISOs was complete I safely removed the Flash Drive...turned off the computer and re-booted to the Ventoy Flash Drive...

I selected Mint 21.1 but it wouldn't boot got errors...Mint 20.3 wouldn't either. The only one to boot was Foxclone but why ?
I changed to a 16GB Lexar Flash Drive...installed Ventoy and dragged in the same ISOs...when done I clicked safely remove drive...I noticed the red light flashing on the drive which means Data is still being written to the Flash Drive.
So I waited 3 to 4 minutes...the red light was out so I removed it then re-booted in to Ventoy and all the ISOs now boot. I then re-installed Ventoy to my Sandisk 16GB Flash Drive and dragged the same ISOs to it...after clicking safely remove drive...I opened Disks and saw this...

The Flash Drive is still being written to...that's why the ISOs wouldn't boot and seems to be a Ventoy thing because I dragged the same ISOs on to an empty Sandisk 16GB Flash Drive and when finished that was it...I could remove it.

Back in the Day Fat32 meant you couldn't copy files larger than 4GB but here's 5.9GB of ISOs being copied to a Sandisk 16GB Flash Drive Fat32 as shown here with no Ventoy on it...

Times have changed...I was going to but a few Lexar Flash Drives but their no longer made and haven't since 2018...didn't know that...anyway I hope this helps someone as it drove me mad for several days.

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