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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB GDDR5 Video RAM

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error code -50 on added second SSD

SSD: Crucial MX300 1TB 2.5 SSD

I replaced optical drive to SSD.

I try and write to the drive I get "The operation can’t be completed because an unexpected error occurred (error code -50)." Under the disc "Get info" permissions are Read & Write for the admin, Read & Write for staff and Read only for everyone. In Disc Utility I can verify and repair the disc but I cannot erase or partition it. It says that it cannot unmount the disc. Any one else have this problem or have a suggestion? Any help is appreciated in advance.

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You're hitting a known problem!

The issue is the optical drives SATA port is not really SATA III (6.0 Gb/s) but something in-between SATA II (3.0 Gb/s) and SATA III.

Here's a reference of which models have this defect: OWC - Data Doubler. It makes no difference who's optical drive carrier you use the issue is within your Mac logic board.

You'll need to install a FIXED SATA II drive in the optical drive bay, but sadly these SSD's are getting hard to find. You can't use a auto-sense drive as it will want to use SATA III which it can't. Also you can't really move the HD over either or get a SATA II HD drive as only hr main HD bay has HD crash guard so you're more likely to kill your drive if you bang your system.

Best to get either a bigger SSD and just use it in the HD port and put the optical drive back or get a hybrid SSHD drive.

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Masashi Tamayama will be eternally grateful.
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