Since they are soldered to the board and not in a socket, it means that you can’t upgrade them either. There are four more on the bottom of the board and these make up the 4GB of DDR3 memory that the Zenbook uses. When removing the SSD we also discovered a row of Elpida DDR 3 memory chips. This might be an issue to enthusiasts that want a specific drive, but when you buy an external storage drive or a notebook you never know what exact model you’ll be getting. Since OEM notebook designs can change at any time there is no way to know what SSD you will be getting for certain. ASUS has been noted for using the ADATA XM11 (SandForce SF-2281) and SanDisk U100 SSDs in these notebooks. The SATA socket used on the ASUS Zenbook is smaller than the standard mSATA socket, so good luck on find consumer options if you want to upgrade capacity down the road. Each of these are obviously 32GB, which adds up to the 128GB capacity of the SSD. After breaking the warranty sicker we pulled out the SanDisk U100 128GB SSD and discovered that their are no MLC NAND Flash chips on the back, which means the four chips on the front are it.

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