New, never used, ready to install, original tags and box. Signed Dell Quantum Atlas V 3.5 series, 18.3 Ultra3 (U160) SCSI, N143. Dell part number JP-037URC-12544-OAN-OOHT, 18.3 GB, 10 000 RPM, 80 pins, 3.5 inches hard disk drive. Dimensions: 5 3/4, X 4 X 1 inches.