Amazing! I followed your Acasis advice. After powering off my Mac Studio and disconnecting my TB501Pro for one minute. I held down the power button of the Mac Studio for 15 seconds, entered my password and WD4T icon (WD850X) appeared 1st time in a week!!!! I am now using the Apple TB5 expensive cable to get the best transfer speed and I also removed my OWC external backup disk (several years old ) to simplify troubleshooting. Thanks. I expect TB501Pro failure to be on Disk utility list no longer appears. Black Magic 5691.2write\5907.4read.
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ACASIS is a technology brand founded in 2008 and focused on productivity devices for 16 years. The brand upholds the core philosophy of "user-centered, making strivers happy," committed to boosting global users' work efficiency and creative experiences through stable, reliable, and user-friendly hardware products.
Starting with a focus on data transmission and hard drive enclosures, ACASIS has steadily expanded into multiple core productivity areas, including Thunderbolt docking stations and video capture cards. As the Mac user base has grown and the live streaming industry has boomed, the brand has keenly spotted market trends, continually iterating on technology and design, with its products selling like hotcakes in over 200 countries and regions worldwide.
Whether among North American tech enthusiasts or Asian creative pros, ACASIS is widely acclaimed for its signature blend of "sleek design + powerhouse performance + effortless usability."See more
