I run a clean installation, including the formatting of the internal disk.
On restart all right, or almost, the external SD card Samsung 10 64GB is not recognized, and every time I try to access it, with various File Manager, tells me that there is a serious problem on the external SD card.
When you first start I chose to use the external SD as a portable memory.
And 'the correct choice?
It will be necessary to repeat the installation?
Can anyone help me solve?