Just got my new laptop (a Dell Precision 5510, i7/16GB/1TB SSD/4k) and after upgrading Win7 to Win10 and shrinking the 1TB disk to create an empty 700GB partition, I booted elementary 0.3.2 (64bit) from a USB created with unetbootin.

So far so good; when choosing "Try without installing" I arrive at the desktop where I can start the installer. The first problem was that no partitions showed up at all in the "Installation type" screen. This was resolved by 

> umount -l -r -f /dev/sda1

After restarting ubiquity, only the 32GB USB disk shows up in "Installation type". What could be the reason for not detecting the empty 700GB partition on the SSD?