Im facing same problem, my computer is not detecting any flash drives on any ports, but they are shown in Device manager but n
I tried formatting the drives on another laptop and reconnecting to my system, but not working. No USB "Mass storage diveses" Working on my computer but still detecting on Device manager!!! But its not showing in Disk Management!
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More aboutfacing problem computer detecting flash drives ports shown device manager
on your desktop try reinstalling the motherboard chipset drivers and usb drivers see if you have a damaged or missing driver.
In Disk Management, check the drives are assigned drive letters and check the letters are not already in use but another drive (e.g. network drive)