Hello Mike Walsh.
Oddly, my SanDisk looks like the top pic, but is a 3.0 version. My presario has a couple of 1 series and one 2 series usb port.
Using the directions for pyro32 install to usb, the drives will boot the os.
It is that the drives were stopping the boot process when they had no os on them, but only backup files. I of course changed the boot order to cd first choice to boot the Precise os I use daily. But I still would liked to have had a definitive answer to the why of it.
Now, I left pyro32 on the Samsung fit 3.0 usb and created a third partition for backup files.
The SanDisk has backup (copies) of files to access on my pi3.
On the SanDisk, after installing pyro32, I deleted the pyro32 directories and files from both created partitions (but left the two partitions). That keeps it from interfering with the boot process of the presario as well. And it of course is not an issue for the pi3 in any case as far as booting.
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