Maybe the confusion is with the description "GoFlex Home Network Storage System"
Seagate has 2 storage systems for home networks and one of them is named Goflex Home. That one has a single 3.5" drive.
http://www.seagate.com/external-hard-drives/desktop-hard-drives/goflex-home/
There is another type called Goflex Net which can accommodate 2 x 2.5" freeagent portable drives
http://www.seagate.com/home-entertainment/media-sharing-devices/goflex-net/
Just be aware that although pictures of the Goflex Net always show it with 2 drives installed, these must be purchased separately. The Goflex Home comes with the drive.
Goflex Net afaik runs Pogoplug software and requires a Pogoplug account (I actually bought a Goflex Net but screwed up the registration process and couldn't use the device so I swapped it for a Goflex Home). Goflex Home runs Hipserv software and requires a Hipserv account with Axentra.
Setting up either the Pogoplug and Hipserv accounts are usually handled through the Seagate registration software but you need an internet connection and because 3rd parties are involved it can cause sometimes cause difficulties (like with me and Pogoplug).
Unfortunately neither is a simple NAS just for use just on a home network, they assume that you want remote access so that is the default and only setup option.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
For the sake of your own health and sanity, if your data is important to you, keep a second copy on another storage (a backup)
