I just received my new MacBook Air 13.3″ (MC965LL/A) and I heard that they put in 2 different SSD’s in each one. I found the best way to check which drive you have, and which is technically ‘better’.
Go to :
Apple Menu > About This Mac > More Info > System Report > Serial-ATA.
You should see something called APPLE SSD :
[zp src=”MBA-SSD.png” album=”blog/apple/” width=”600"]
If it is TS it is a Toshiba and probably a bit slower. If it is SM, it is a Samsung drive and faster.