OWC offers in the U.S. can send your iMac 27 “for the installation of an external eSATA ports. The adapter only works with iMac 27 “iMac to be exact and identified by System Profiler as” 11.3 “(to check your model just select the Apple menu item” About this Mac “and click” More information: the identifier of the model will appear in the “hardware”).
The adapter bracket is a bit ‘expensive ($ 169 including shipping and assembly costs in 48 hours), but makes possible the use of various external storage devices.
Serial ATA, as its name suggests, is a high-speed serial communication which is now replacing the older ATA (parallel). The interface is designed to overcome the limitations imposed by the old standard and provide a significant increase in performance.
The data transfer speed SATA II arrives theoretically up to 3.0 Gbit / sec.
Source:http://www.macitynet.it/macity/articolo/Una-porta-eSata-per-gli-iMac-da-27/aA45207
