This is an external HDD from BUFFALO. Capacity: 500GB (displayed as 499.98GB) Format: MS-DOS (FAT32) I have confirmed that it is recognized when connected to a Mac before listing (see image). Please note that detailed inspections such as long-term continuous use tests and full sector checks have not been performed. [Included Items] ・Main unit ・AC adapter ・USB cable (as pictured) [Condition] Used, so there are scratches and minor imperfections from use (scratches on the front panel). Please check the photos for the condition. Instant purchase is welcome. Thank you.