WRT610N doesn't detect USB hard disk - Wireless Routers - Linksys Community Forums
30-30-30 reset for Linksys WRT610n v2 got me out of a jam while loading DD-WRT... up and running great now!
1. DO A HARD RESET *BEFORE AND AFTER* YOU FLASH FIRMWARE. This does not mean hitting the reset button and saying you are done. This means doing the 30-30-30 reset. To do a 30-30-30 reset you must push the reset button with your router powered on. Hold it for 30 seconds with the router powered on. STILL holding it, pull the power cord for 30 seconds. Still holding it, plug the router back in. You will have held the button for a full 90 seconds without releasing it.