tuning-adapter with USB connection to the TiVo to enable SDV. Some MSOs now offer these adapters for free to their customers with TiVo DVRs. Drive expansion TiVo has partnered with Western Digital to create an external hard drive, the My DVR Expander eSATA Edition, for TiVo HD and Series3 systems. The external drive plugs into the TiVo box using an eSATA interface. The first version of the eSATA drive shipped was a 500 GB drive that shipped in June 2008. In June 2009 the 1 TB version of the drive began shipping. The 1 TB version expands the TiVo HD and Series3 systems' capacity by up to 140 hours of HD content or 1,200 hours of standard programming. TiVo was not designed to have an external drive disconnected once it has been added, because data for each recording is spread across both the internal and external disk drives. As a result, it is not possible to disconnect the external drive without deleting content recorded after the external drive was added. If disconnected, any recordings made will not be usable on either the internal or external drives. However, the external drive may be removed (along with content) without losing settings. Various capacities of external drives have been shipped since the product was initially released. There were reports of product reliability issues, and a brief period of unavailability. The Western Digital 1 TB and 500 GB My DVR Expander eSATA Edition and My DVR Expander USB Edition drives have been discontinued and replaced with the Western Digital My Book AV DVR Expander 1 TB drive. This drive has received a facelift from the previous generation, which now sports a glossy finish, and a tiny white LED power indicator, along with a push button power switch in the back. The biggest change is that this drive now includes both eSATA and USB in one device. This device is DirectTV, Dish Network, TiVo, Moxi, Pace, and Scientific Atlanta (Cisco) certified. Seagate has come out with their own DVR-oriented drive called the Seagate GoFlex DVR which comes in a 1 TB and 2 TB capacity. TiVo has not approved the Seagate product for use with TiVo DVRs and they will not currently function with any TiVo products. Hacking Users have installed additional or larger hard drives in their TiVo boxes to increase their recording capacity. Others have designed and built Ethernet cards and a Web