Among the different configuration options available when using the OWC Data Doubler in your MacBook or MacBook Pro is setting both drives to function as a RAID 0 (striped) array. This combines both drives (the one in the Data Doubler equipped optical bay and the one in the original hard drive bay) into a single volume, which provides an increase in data access speed.
Since we’ve had several questions about this, we decided to put this configuration to the test by using different combinations of hard drives and SSDs to determine which offered the best balance of price, capacity and performance.
Our test machine was a 2011 13″ MacBook Pro (MacBookPro8,1) with a 2.3GHz Intel Core 5 processor and 4GB of RAM. Inside, we replaced the optical drive with an OWC Data Doubler to allow us to utilize a second drive.
Every now and then, you may find that your startup seems slower than normal or that some things are just not working the way they used to. When that happens, it is usually best to be proactive, rather than putting it off until the problem potentially gets worse. There are numerous things that can cause problems with your Mac, both hardware and software. When working with computers, it pays to not only have a physical 
Upgrading your machine is a great way to bring out the best in it and allow it to do what you need it to accomplish. Over the years, there have been some common problems that keep popping up. Though most of you probably know them already, it sometimes slips by the wayside in eager anticipation of getting all those benefits the upgrades will bring.