Opened and used only once. It's in beautiful condition, like new. Can be used for backing up data or recording on TVs and computers. The capacity is 1.0TB. 【High-Speed Transfer with USB 3.0 Connection】 USB 3.0 connection allows for high-speed transfer of videos and photo data, which previously took a long time. Transfers approximately 5 times faster than USB 2.0. Can be used as usual with conventional USB 2.0. *Measured values in our test environment. Please note that transfer speeds may vary depending on your environment. 【PC Power Link Function】 When the PC is turned off, the rotation of the HDD connected to this product will also stop immediately. You can use it with peace of mind even if you forget to turn off the power of this product. 【ACCESS & POWER LED located on the back】 The LED is placed on the back so that the brightness of the LED is not noticeable. 【NTFS Format Model】Recommended OS: Windows 10 / Windows 8.1 / 8 / 7 (Can also be used with Mac OS, etc. *Requires changing to FAT32 format) Instant purchase available Mercari delivery