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I have replaced my optical drive in Macbook Pro mid 2012 with Optibay disk - Hitachi Travelstar 5K1000 1TB internal harddrive (6,4 cm (2,5 inch), 5400rpm, SATA III). I have formatted it to Mac OS Extended (Journaled). When I try to copy few big files - approximately after 10 min of copying I get this error message

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and the drive disappears from disk utility and is only visible in the System Information menu as unknown. It appears again only if I do the safe boot and then again boot normally. Could you please help me. Thanks.

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  • I've added the image inline for you. For some reason your host didn't let me simply supply the url to the image, so i ended up needing to download and upload it. Using Imgur even when you lack the rep to use the built in image linking function makes things a little easier for someone editing your question
    – Journeyman Geek ♦
    Commented Feb 28, 2013 at 8:42

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Those Macbooks have that problem when using SATAIII 6Gb/s, downgrade your harddrive to SATAII 3Gb/s

http://www.mcetech.com/optibay/sata3to2.html

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