1. Packaging appearance. Genuine Sony EF90 tapes usually have exquisite packaging boxes, and there will be Sony's trademark and related logos on the box, such as model, capacity, etc. If the box looks low-quality, has blurry fonts, or lacks logos, it may be a counterfeit product.

2. Tape surface. The tape surface of a genuine EF90 tape should be flat and smooth, and should have no obvious flaws, scratches or stains.

3. Tape reel. A genuine EF90 tape reel should be sturdy and not easily deformed, and should show no signs of looseness or damage.