Figure 2 in the accompanying power point file shows historical storage areal density (AD) growth for HDDs (this is directly related to the amount of digital storage that can be put on a disk in a hard disk drive) from Q1 2000 through Q1 2011.
For hardware, Google has its own dedicated Network Box with a four-port gigabit Ethernet router and 802.11n WiFi, a TV Box with live viewing and a WiFi access point as well as a Storage Box DVR with 2TB of data and the ability to record eight shows at once.