Under Show these items on the desktop ... ve tinkered with your Finder app settings, your Mac may not be identifying your USB flash drive or external hard drive because of some random glitch.

Make sure the is USB Drive is not Write-Protected Scan your Computer & USB for Virus Run CHKDSK scan on the USB Format USB Drive using Command Prompt Let us talk about them in detail. The first ...

USB Write access or USB Write protection is the security feature that can be enabled for any USB Data storage. The main purpose of enabling USB write access is to maintain the integrity of USB ...