Yesterday, we noted that Apple's new 27" iMac for the first time allows users to configure their machines with a second hard drive, offering a 256 GB solid state drive as an option for the second bay.

The upgrades involve a four-step process: ° Start by adding the only available eSATA port offered for the iMac for $169. Or add an OWC Mercury Extreme Pro SSD up to 480GB in capacity from $319. ° ...