ASKER
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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A P4000 G2 Storage System will easily upgrade your capacity on the existing P4300, and this is from HP themselves.
https://h10057.www1.hp.com/ecomcat/hpcatalog/specs/provisioner/99/BK716A.htm