• You can't do this directly with any cable. The desktop doesn't have any capability of accepting an eSATA input as a means of controlling an internal drive. eSATA is not a SAN protocol. The only way you could do it is by removing the SATA HDD and placing it in an external eSATA enclosure which can be accessed by the laptop's eSATA port. If you were wiling to spend the money this could be done with removable hard drive trays. Cremax makes external HDD eSATA enclosures which use removable trays. They also make internal desktop HDD enclosures some models of which use the exact same trays as the external enclosure. Therefore you could 'unplug' a drive from a desktop and then plug the tray into an eSATA enclosure connected to your laptop. The Cremax website has a nice flash demo showing this feature. It would cost about $100 for both the external and internal desktop enclosures. If they were the correct models using the same trays hard drives could be plugged back and forth between the two. It would require installing the internal drive tray which if you weren't afraid of cracking open your PC case would take about 10-20 minutes to install.
  • Info taken from External Serial ATA is actually a subset of the additional specifications for the Serial ATA interface standard. It is not a required function, but an extension that can be added into both controller and devices. In order for eSATA to properly function both must support the necessary SATA features. This is particularly important as many early generation SATA controllers and drives do not support the Hot Plug capability that is critical for the function of the external interface. Even though eSATA is part of the SATA interface specifications, it uses a very different physical connector from the internal SATA connectors. The reason for this is to better shield the high speed serial lines used to transfer the signals from EMI protection. It also provides a 2m overall cable length compared to the 1m for internal cables. As a result the, the two cable types can not be used interchangeably. I hope this helps. Just simply as for and eSATA cable or do a search for one on the net.

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