I’ve been getting this error after the first time I click the power button on Disks (as instructed by Swarf here). Then the device shows as mounted after that. When I click the button a second time, the device is unmounted. This two-time-clicking only happens for a 123 gb san disk ultra pen drive. My other usb drives don’t give problems. Also, this just started happening recently. I reformatted the san disk to Ext4 (Linux option) and it still gives the same error message. Can’t figure out why it started to act up. Thoughts?
Hi, I always leave the file system on the thumb drives as is - biggest I have is a 64 Gb Patriot drive. The only file system i use is FAT32 for MultiSystem use. 
Thanks, swarf, I’ll do that in the future. This one has been formatted many times already. It has been doing less of that message but still does once in a while. Random.
Hmm! Formatted many times eh? Remember it is the same as an SSD - the more re-writes the shorter the life of the stick!
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I didn’t know that.