Tablets have no moving parts, such as those prehistoric optical drives that will soon vanish from laptops too, thanks to the popularity of diskless (and disc-less) PCs like the MacBook Air and its Windows clone, the Ultrabook. That's all well and good--until you need to access a stack of DVD backups that you burned a few years back. Maybe you've archived important business files to Blu-ray too. Well, tablet fan, you better move those files to the cloud, because you can't insert a DVD in a tablet. Of course, you could always carry cumbersome gear, such as an external DVD drive and a cable or two, just in case you need them. But who wants to do that?