Hi! I bought a Raspberry Pi 2 about 2 months ago. Becuase I saw many recommendations on USB installation (more reliable, faster etc.) I bought a SanDisk USB3 drive and got a very very simple (class 2) microSD card. I followed this tutorial to install OpenELEC on the hard drive and it worked perfectly.
However, I decided to move to OSMC because OpenELEC has readonly filesystem which make things complicated. I googled how to install it on USB drive but found nothing. I saw there’s an option to install it on USB, but it didn’t understand what I should do with the SD card.
Is there any way to install OSMC on USB drive? It would be terrible if I bought this expensive USB for nothing 
.
Thanks in advance!
run the installer and select USB from the options 
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Your USB3.0 drive will be better than just using a USB2.0 drive so it wasn’t a total waste.
Have a look at this link
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Select the USB install and allow installer to write to SDcard. Then boot pi with sdcard and USB connected.
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I plan to do this but what are the minimum sizes for the SD and USB in this configuration?
Technically a 256M SD should work but recommend to use a quality 2GB SD Card and a minimum of 8GB USB.
But depending on how you store your data a quality fast SD card of 8GB is also a good choice for a OSMC medium ignoring the issues a USB Stick can add to the equation
can I use an SD card for copying boot files of OSMC(which I want to boot from usb drive) that already contains raspbian downloaded from NOOBS?