Sony marked these as hidden files
So what you do is when your flash0 is connected via a usb
in the window you see your root flash0
go to tools / then folder options...
when in folder option go to the view tab, scroll down untill you see Hidden Files And Folders and tick the box that says "show hidden files and folders"
And UNcheck the box that says "hide protected operating system files"
now you can access your full 3.71 flash0