so after reading the blog... if my conclusion are correct, I could avoid installing of the drivers for the 3.0 usb by simply using the e-sata/2.0 usb combo (which does not requires the drivers to be install). So I could just install the OS w7 from this e-sata/2.0 usb combo
so about the envy 15t model thats it says on the back of the laptop the product id is : NX346AAR i hope this help more
In response to formatting click ok.. then right click on the box where it says disk 1 and choose format and file type NTFS