Good Morning:
The flash-drive that won’t open is FAT 32. I plugged in the mouse and it works perfectly.
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Okay, looks like I have to re-format all my flash-drives with Discs. Not a big deal but what baffles me is both my old IdeaPad with Ubuntu and my Windows ThinkPad have no trouble opening the flash-drive which I use to back-up my daily work. Hmmm…
Thanks everyone,
Katie
Do you have dosfstools installed?
pacman -Qs dosfstools
No. Please explain…
I’m not sure if it’ll make a difference for using an existing fat filesystem, but it’s needed for creating fat filesystems. Might be worth a try.
https://wiki.archlinux.org/title/FAT
I’m sure there used to be another package for fat, but I can’t remember it or find anything on it atm.
I was thinking of exfat, either exfatprogs or exfat-utils.
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Thanks DMT. I’ll install and see what happens.
It’s odd that it worked before, if additional packages may be needed now.
Since it’s a FAT flavour not NTFS, I’d assume that Linux tools would be better able to check for and fix filesystem errors … 
It’s strange that none of the USB flash sticks read, though, if this is the case.
Still, we have established that the ports actually are working, so I suggest a change to the topic title. 
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Well I got the Sandisk flash-drive working. I first installed exfatprogs (thanks dmt), then did the same for the Sandisk as I did for the Samsung drive: I pasted the folders into an Ubuntu folder, the put the drive into my Manjaro machine, formated to FAT. Then put the drive back into the Ubuntu machine to copy the files back onto the Sandisk drive.
It now opens in Manjaro and I’m using it again. Phew!
So the problem is solved, but not a very satisfactory ending. Still don’t know why it happened nor why all my flash-drives worked on my Ubuntu and my Windows machines but had to be reformated in Discs (Gparted couldn’t do it), before Manjaro could access them.
Anyway much thanks to everyone here who took the time to help.
Katie
It’s great your issue is sorted! 
However, this Forum doesn’t work like some others, where you add [SOLVED] to the title; the standard practice here is to mark the post which best helped you find the solution, by clicking the Solution button below that post.
All the best! 
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There is a Solution button beneath every post.
In future, please use that to mark the post of the member who solved or helped you the most to solve your issue.
While adding “Solved” to the title may be acceptable with some forums, that is discouraged on the Manjaro forum.
Regards.
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