You can add 128gb more by keeping a class 10 SXDC card into the SD slot. This storage can be as fast ad 50% of a SATA SSD and faster than tablet (eMMc) SSDs. If you usef the SD card to store all data and media files - really, everything but applications and the OS - you will notice absolutely no difference in speed than if you had a 256GB SATA SSD. Sorry I'm on my cell and in a hurry so won't be able to provide link, but you should find dozens on Amazon for as little as $40, up to $75, but in no case pay over $60 as these things are commodities and in price freefall. Get a card that is full size SD with class 10 rating and 4.5+ stars for avg review with over 1,000 reviews.