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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After much pain, we put in the old 250GB drives, powered on, deleted the array, powered off, replaced one drive, attempted a format (which always failed), rebooted, tried to format again (this time succeeding), and repeated power-off, replace 1 new drive, failed format, reboot, successfully formated again until all drives were formated. THEN we were able to create a RAID 5 array w/ the new drives.