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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

enter image description here

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.

  • 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 Feb 28 '13 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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