It's the HS-DH0-0TGL/RL5 running under XP Pro throug a LinkSys WRT 100. There are no error messages on the unit itself. All four drive lights are flashing. Link/ACT light is on. When the TeraStation is turned off, My Computer loads just fine and allows me to access all drives. When the TeraStation is turned on and loads, access to My Computer turns very sluggish and sometimes crashes. When I try to access it from a program, it reports that that drive is already being accessed and the program cannot reach it.