Unplugging a memory drive without ejecting it can leave it in an inaccessible state.
If a flash drive is acting up, you can reformat it using Disk Utility, found in /Applications/Utilities.
When plugged in, the drive should appear on the left, even
if it didn't show up in Finder.
Having selected the device, you can check it in the First Aid tab and
try the Repair option, but this is designed for hard disks and may not
help sometimes.
More likely, you'll need to go to the Erase tab and
reformat it. Choose MS-DOS (FAT), which works with both Macs and PCs,
and click Erase (not Erase Free Space).
To Format the Flash on a Windows System to make it readable on Both Windows and Mac choose ExFAT. These should make your flash accessible on both platforms.
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