Thank you for viewing. * Instant purchase OK * No-message transactions OK (Feel free to contact me only if you have inquiries or questions) * I will greet you after purchase, but no reply is needed. Capacity: 500GB, USB external HDD. Bus-powered type, no AC adapter required. Have you ever been in trouble because your computer suddenly broke down and you didn't have a backup? How about using this for data backup in case of emergencies? Also, the HDD is formatted in NTFS, so If you use it on a computer, you can use it simply by plugging it in. If you use it with something other than a computer (TV, etc.), you may need to format it, so please check the manual. [Included items] ・Main unit case (unused, new) ・USB 3.0 cable ・HDD (used, built-in) ★★★★Important Notes★★★★ ・The built-in HDD is used, but I have confirmed that there are no issues with CrystalDiskInfo. ・It can also be used with Macs, PlayStation, TVs, recorders, etc., but you need to initialize it according to the instructions of each model. Also, when using it with something other than a PC, please check if the device supports bus power. If it is not supported, you may need to connect it via a USB hub with a power supply.