Assign a drive letter to the external hard drive. In device manager ,under storage controllers ,'USB Attached SCSI (UAS) Mass Storage Device' comes Hard drives, whether they or new or old, internal or external, can suddenly begin not showing up in the File Explorer or Disk Management. Now, you can either connect it to another computer by installing it in a PC or attaching it as an external hard drive. Make sure your MP3 Share USB Drive from Wi-Fi Router. If none of the above solutions work, formatting external hard drive is the only solution that can fix parameter is incorrect issue.