For what it is worth, I have this problem as well. The drive tray wouldn't even eject with one cable, so I flipped to another. I could then open the tray (seems odd to me) but the disc would not mount. Here is the console log info that indicates that the OS is getting incorrect feedback from the driver saying the disc is faulty. This same reader/cable/disc work fine on my 10.10.5 MacBook Air and had worked perfectly fine with this same MBP prior to service (and 'complimentary' upgrade to EC by Apple).
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Console
1/9/16 12:34:49.000 kernel[0]: 011849.735343 AppleUSB20HubPort@fa130000: AppleUSBHostPort::resetGated: retrying enumeration in 100 ms
1/9/16 12:34:50.000 kernel[0]: 011850.924723 AppleUSB20HubPort@fa130000: AppleUSBHostPort::resetGated: retrying enumeration in 200 ms
1/9/16 12:34:51.000 kernel[0]: 011852.236095 AppleUSB20HubPort@fa130000: AppleUSBHostPort::resetGated: retrying enumeration in 400 ms
1/9/16 12:34:52.000 kernel[0]: USBMSC Identifier (non-unique): (korean characters removed) 0xe8d 0x1956 0x0, 2
1/9/16 12:35:10.000 kernel[0]: disk3: alignment error.
1/9/16 12:35:12.432 mds[74]: (Volume.Normal:2464) volume:0x7ffc330a4c00 ********** Bootstrapped Creating a default store:1 SpotLoc:(null) SpotVerLoc:(null) occlude:0 /Volumes/ENTOURAGE
1/9/16 12:35:12.456 mds[74]: (Volume.Error:577) vsd:0x7ffc33173400 Open failed. failureCount:0 (null)
1/9/16 12:35:23.000 kernel[0]: smb_smb_ssnsetup: SOL doesn't support extended security, this server will be deprecated in the future!
1/9/16 12:35:27.471 mds[74]: (Volume.Normal:166) vsd:0x7ffc33173400 DisabledStore recycle:0 context:{
DisabledRecycleCount = 1;
}
1/9/16 12:35:27.502 mds[74]: (Volume.Error:577) vsd:0x7ffc338c6000 Open failed. failureCount:1 {
DisabledRecycleCount = 1;
Samsung Se 506cb Driver
}
1/9/16 12:35:57.502 mds[74]: (Volume.Normal:166) vsd:0x7ffc338c6000 DisabledStore recycle:2 context:{
Samsung Se 208gb Rsbd Drivers
DisabledRecycleCount = 2;
}
1/9/16 12:35:57.540 mds[74]: (Volume.Error:577) vsd:0x7ffc308c8400 Open failed. failureCount:2 {
DisabledRecycleCount = 2;
}
The drive works perfectly fine with this disc on 10.10.