When the interference becomes too high, the entire SATA bus resets, and your hard drives drop off the map. If you looked at the SMART data for the drive, you would see a very high volume of dropped/corrupt packets, hundreds of error corrections per second, and a bus reset every now and then. In this scenario, the hard drive receives too much interference from the WiFi radios. When it comes to an optical bay HDD adapter, however, a portion of the logic board for the caddy (which is also unshielded) is directly underneath the WiFi/Bluetooth ribbon. This is the way Apple designed it - tight and compact. The lower speed requirements of the optical drive mean that it can handle a little interference with no problems. Also, the optical drive is a SATA-2 device even though the connector is SATA-3. The EMI gets absorbed by the optical drive's metal case and the metal outer case of the MacBook Pro. Normally, this interference doesn't matter. It is caused by electromagnetic interference (EMI) from an unshielded WiFi/Bluetooth ribbon cable that passes directly over the optical bay between the radio (right next to the optical drive) and a connector on the motherboard (right next to the optical bay SATA connector). This is a known issue with placing a hard drive in the optical bay of 2011 and later model MacBook Pros.
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