My understanding is that it is going to be from the day of purchase. You will have to register online with Linksys and they will ask the date of purchase. The warranty will be from whatever date you enter for purchase date. (keep in mind you will most likely need to have your purchase receipt if you need warranty coverage).
We posted your question in our Community Forums where a user replied with some information and a link for the hardware information of the device.
Any storage you attach to a wi fi router will be very slow, especially compared to wired links. There are several reasons for this but the most important one is a router is designed to make sure no one link/channel sucks up the entire bandwidth that is available. If you had a "business" router you could establish rules that would let you work around this but consumer models are made to be "user friendly". You *might* be able to tweak the "game" settings to allow greater throughput but then you would have to set up your storage programs to use certain ports.
IMO you are better off using wired LANs (and/or one of the four Ethernet ports on the router) for heavy duty storage transfers. However, this unit will do just fine if all you need are routine backups (especially at night) and nominal file access by a few users.
I have 1TB attached through the USB port and another 2TB attached via wireless and while transfers are slow they are acceptable for home use. Note that USB is going to be the slowest of all choices with a router, behind wi fi (a bit faster) and ethernet (very fast).
No, it wasn't necessary to install the CD info on the other computers, only the one making the initial set up. My Kindle Fire connected easily as did another family member's Mac laptop. All that was needed was the password. Couldn't have been easier.
Have you tried a hard reset? With the device powered on, push the reset button for 30+ seconds. After the hard reset power cycle it one more time. It will erase any settings from the device, but it is kind of the last option before buying a new router. You will have to connect through ethernet cable.