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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Problems after installing SSD as second drive.

I've installed a Samsung 840 SSD to the second SATA-Port of my iMac along this tutorial: Installing iMac Intel 21.5" EMC 2428 Dual Hard Drive Kit. HDD is still on first SATA-Port, OpticalDrive is still on thirst SATA-Port. Then i've installed Mountain Lion on SSD and made it bootable. SSD and HDD work fine. But, after this modification i have problems with all USB-Devices, Firewire-Devices and the OpticalDrive. DataStreams break up constantly, so transfering data to external devices is very slow and jerky, also reading from DVD. Burning a DVD is really impossible because break of DataStream. Getting following error: Unable to burn. The disc drive didn't respond properly and can't recover or retry. Sometimes I also loose connection to USB-Devices. Everything worked fine with Lion and without SSD.

My first idea was, that the SSD slows down the USB-Controller but i have no idea why the OpticalDrive and Firewire are affected too. Maybe then the problem is the Bus between controllers and CPU/Ram? Does anybody know something about this problem?

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I think you're pushing that box too hard, expecting power performance from what is essentially a "home user" device. You made no mention of how much RAM is in the box, nor how much free space on your boot drive. Insufficient RAM and an almost full boot drive can cause read/write problems.

Change (reduce) your burn speed for your DVDs from the preferences settings of your burning software. Make it ~1/2 the stated speed of the drive, or the media. (Sometimes bad media is the cause of optical drive write errors.)

Use the SSD for booting but put all your transfer data on the HHD. Try using a self-powered USB hub if you have a lot of peripherals.

If this answer was helpful please remember to mark it accepted.''

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