Optical media heading for the scrapheap
Spinning media is good in one way. It requires no power to store. However if you have a large archive it takes a bit more effort to keep it organised and then you have to go digging for it. HDD's are good and RAID arrays are better. However it takes power to keep it up and running and drive failures are a fact of life. Also we are now having to swtich from IDE to SATA as the interface gets phased out on modern motherboards.
I am looking forward to SSD's becoming larger and cheaper. They take less power, cause less heat and should be much more durable than spinning media. Also RAID should be needed less. Since SSD's being used for storage requires few writes, they should theoretically last a lifetime (assuming there is hardware to read them).
Eventually though we will have a small matchbox sized unit for local storage and everything else stored in the 'cloud'.