Reply To: USB flash drive not showing up Welcome Page › Forums › RetroPie Project › New to RetroPie? Start Here! › USB flash drive not showing up › Reply To: USB flash drive not showing up 02/21/2016 at 04:14 #117651 vinsegaParticipant Okay I will post soon. I just noticed on boot up it says failure to start USB mount@dev A SDA services. If that’s the problem how do I fix it?