This is a BBC Master 128 setup with the Acorn Winchester Disc attached. This is how a computer hard disc system would have looked 20 or 25 years ago, with the external hard disc unit taking up quite a bit of space!
It's hard to get a good sense of the size of things in isolation, so I think this picture helps to put things in proportion. For those of you still able to comprehend measurements given in the old money, the Acorn Winchester Disc is about 14 inches across and deep by 5 inches high.
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