Apparently, when you connect a hard drive that uses the SATA3.0 connection, performance is not as expected or the drive is not even detected.
After several tests it seems that the problem causing low SATA3.0 disk performance and even not being detected is due to the cable connecting the disk to the motherboard. The reason? The poor quality of the insulation of this cable which seems not to prevent interference with other components.
Some users, in the absence of Apple’s pronouncement and verification of whether or not it is the cause of the conflict, seem to have solved the problem with something as simple as covering the cable with aluminum foil . This is a temporary solution but it should not be, because if that is really the reason Apple should offer to change the cable. Anyway, we will be attentive to confirm the real cause.
Important: we clarify that only the new laptops presented in 2011 are being affected. Users with models prior to 2011 do not seem to have reported any problem. And you, have you suffered this problem?