The disk-drive has malfunctioned.
Search online for a professional "data recovery service".
For a significant fee, they can repair your disk-drive,
just long-enough to copy your files to a new disk-drive.
If it still has a valid WARRANTY, exercise the warranty to get it repaired/replaced.
If the warranty has expired, then open the case, remove the disk-drive, buy a new "compatible" disk-drive, connect it, and thus "revive" your external storage device.
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