Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.
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Also, in order to be able to use the extra space you may need to expand the Array (or add a 2nd one) using your PERc's utility, & after that, depending on the OS running, also add the extra space there...