Buffalo HD-NRLD4.0U3-BA 4TB External Hard Disk Drive Standard Model Black This is an external hard drive from Buffalo. Operation confirmed. Purchased new at the time (around 2020). I would like to sell it to someone who understands that it is a used item. *I am not familiar with home appliances, so to avoid trouble after purchase, please refrain from contacting me with reasons such as not knowing how to use it after purchase. I will not be able to respond to inquiries about connection methods, etc., after purchase, so please understand. [Manufacturer's Instruction Manual] https://www.buffalo.jp/product/detail/manual/hd-nrld4.0u3-ba.html I am also selling TVs and Blu-ray recorders.