Thank you for viewing! This is an external hard drive that supports USB 3.0 connection. It's assembled in a new case and ready to use right away. It's bus-powered, so no AC adapter is needed. ✅ "Healthy" status confirmed with CrystalDiskInfo ✅ Formatted and tested on Windows 10 ✅ Compatible with TV recording and PS4, etc. (※ May not be compatible depending on the device) 【Product Contents】 ・Used HDD (640GB, operation confirmed) ・New HDD case (assembled) ・USB 3.0 cable x 1 ※ No drivers needed, ready to use. 【Supported OS】 Windows 7 / 8 / 10 / 11 Mac OS X 10.4 or later (with USB 3.0 port) 【For those using it for TV recording】 You can record programs by connecting it to a TV with a recording function. Formatting on the TV side is required for use. ※ May not be usable depending on the model and connection environment. Other capacities (250GB / 320GB / 500GB / 750GB / 1TB, etc.) are also available. Please feel free to comment if you have any questions. Thank you very much.