storage device problem I have InFocus M2-4G mobile.There have no option of 'Default Write Disc'. When installing any apps  it has directly Installed   to the Internal storage after that move it manually  to sd card .but do not directly Installed  to sd card.so
how to directly  install to sd card. Pleas suggest me the details solution.
Default Write Disk option is available only when the option is included by your phone's manufacturer. Unless it's included by default, you have to manually move apps to SD card. 

If your phone is rooted, there are many apps available in store that does this job. Link2Sd is one such app. This app can be used in 2 ways


Move apps to sdcard automatically/manually
Create a secondary partition in memory card and link apps to that partition automatically/manually


To automate installation of apps to sdcard, do the following:


Goto Link2sd→Settings
Under Native App2sd Settings, select Install location
Set it to External


If you haven't rooted your phone, just Google it