OS...Windows It's Windows 7. The hard drive capacity is listed as 160GB. It's from KDDI, which is au. CDMA HID01 Product Code: HID01 1MAA SHIDN 092658 Manufactured January 2011 T AD09-0363001 R 001IVAA 1011 001NXAA 1166 001XZAA 1301 001ZYAA 1100 It's an Acer. It can be used in a car, and there's a cord so you can use it even without charging.