This is usually what happens when you eject a hard drive without safely removing it. However, considering the troubleshooting you've done so far, it seems like the drive might have failed or at least, the file system got corrupted for sure. I'd recommend you to check the HDD's health and SMART data by running the QUICK & EXTENDED tests using WD's Data LifeGuard Diagnostics for Windows. It's also available for Linux and Mac operating systems, as well as included in a couple of LiveCD/LiveUSB programs.This seems very unfortunate, :( I'm sorry to hear about your massive movie collection. The latest version works with Windows 11, 10, 8, 7, and Vista, but there's an outdated edition you can get for older Windows versions. This program can be downloaded for Windows as a portable program or as a regular program with a normal installer. GSmartControl runs three self-tests to find drive faults: Short Self-test takes around 2 minutes to complete and is used to detect a completely damaged hard drive, Extended Self-test takes 70 minutes to finish and examines the entire surface of a hard drive to find faults, and Conveyance Self-test is a 5-minute test that's supposed to find damages that occurred during the transporting of a drive. View and save SMART attribute values like the power cycle count, multi-zone error rate, calibration retry count, and many others.

GSmartControl can run various hard drive tests with detailed results and give an overall health assessment of a drive.

When exporting information, it includes everything, not just a specific result you want to save Doesn't support every USB and RAID device

Wd drive utilities not detecting drive