USB external hard drive, model HDCZ-UT4KC, made in Japan. Industry's smallest (※at the time of release), USB 3.2 Gen 1 (USB 3.0) / 2.0 compatible, 4TB external HDD. Can be installed both horizontally and vertically depending on the application. It can be used for a wide range of purposes, such as connecting to a computer for storing videos and photos, or as a backup destination for TV recordings and video camera data. With the free downloadable software "NTFS-3G for Mac I-O DATA," it can be used fully in both Windows and Mac environments without reformatting. - Model Name: HDCZ-UT4KC - Country of Manufacture: Japan - Accessories: AC adapter - Connection Type: USB Usage period: 3 years There are no problems with its use, but I am selling it because I have a new TV and will also be getting a new hard drive. There is no dirt, but there is one scratch. Please understand this before purchasing. Thank you for looking.