 The second-generation Zune 4, 8, and 80 devices, manufactured by Flextronics, introduced the touch-sensitive Zune Pad, which was shaped like a squircle.The 4 and 8 GB Zune devices use flash memory and are smaller in size than the 80 GB version, which uses a hard drive.The 30 GB Zune was not redesigned, although it received a software update that brought its interface in line with the second generation models.