This is the Buffalo HD-SQS6U3-A, a 3.5-inch external hard drive compatible with SeeQVault. ◎ Purchased in August 2025 and tested once, but I am selling it because my Blu-ray recorder did not support 6TB. ◎ All accessories are included. ◎ Please consider this item only if you understand that it has been opened once. - Brand: BUFFALO - Model: HD-SQS6U3-A - Capacity: 6.0 TB - 4K Support: Yes - Connection Method: USB 3.0 - Accessories: Power adapter, USB cable, Instruction manual Key Features: Compatible with SeeQVault, allowing you to transfer recorded programs even if you replace your TV or recorder. Supports 4K recording. Equipped with the "Mimamori Aizu for AV" failure prediction function. Features a quiet, vibration-resistant design and heat dissipation design. Compatible manufacturers: Supports over 20 manufacturers, including Aquos, VIERA, BRAVIA, REGZA, and Hisense. Important Note: Your TV or recorder must support SeeQVault. Transferring recorded programs is only possible between devices from the same manufacturer. If you have any questions, please feel free to ask in the comments, and I will answer them.