This is a 1TB "My Passport for Mac" portable external HDD made by Western Digital. The data has been completely erased, and functionality has been confirmed. 【Product Condition】 Health Status: Confirmed "Healthy" by dedicated software (CrystalDiskInfo). Usage Time: Very low at 520 hours, in quite good condition for a used item. Appearance: Scratches and dirt present. Please check the images. Defects: One of the cushion feet on the back is missing. See image 14. The other feet are in the condition shown in image 15. 【Ready to Use】 Formatted in "exFAT" format on Windows. You can use it immediately on both Windows and Mac computers by simply plugging in the cable, no setup required. 【Specifications】 Model Number: WDBLUZ0010BSL Capacity: 1TB (931GB displayed) Connection: USB 3.0 Please research the details based on the model number. A hard case is included, although it's a different size. Please contact us before purchasing if you have any questions.