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1. Storage systems overview The diagram below illustrates the comparison of different storage systems. Storage systems fall into three broad categories: Block storage File storage Object storage 1. Block Storage Block storage came first, in the 1960s. Common storage devices like hard disk drives (HDD) and solid-state drives (SSD) that are physically attached to servers are all considered as block storage. Block storage presents the raw blocks to the server as a volume. This is the most f...