Fix for some USB OTG issues
If USB OTG is not working right for you, but you have the correct adaptors and are providing power then check this thread on RootWiki
[The app] (http://www.zen24223.zen.co.uk/TPUSBUMount_v1.apk) that RootzWiki Super User Dobi has made has enabled me to use flash drives.
I am not entirely sure if I've understood it correctly, but I think that it gets around an issue where the Touchpad believes a device wants more power than is available so refuses to allow it to work.
I'm using this 2xAA battery powered charger to allow flash drives to be used when away from mains power.
I'd tried loads of things, including wiping my Touchpad (ACME Uninstaller) and installing CM9 again from scratch as all the videos and forum posts I saw indicated that OTG should "just work" so I hope this info will be useful.
Posted Feb 7, 2013, 1:08 AM UTC
I don't think power should be an issue. The TP itself supplies no power, the OTG power lines are not connected internally, so you have to use the external power supply. It doesn't know how much current is available due to this, because your "dumb" power supply doesn't advertise its current rating like a PC or proper OTG would. I think the bigger issue is that flash drive mounting isn't a default feature in Android, so you have to issue the mount command either via an app or by hand at the terminal. Same goes for using SD cards that are not formatted as FAT32 or external hard drives that are NTFS, you have to mount them manually and tell the OS what filesystem they use.
I'm not sure if it's to do with mounting 'cos Stick Mount couldn't detect the flash drives until I ran this app. Once the app had "fixed the power issue" stick mount could mount/unmount the same as it can on Nexus7.