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My prediction is never. That is, not a petabyte "hard disk". Although a petabyte SSD is likely to be available within the next ten years, spinning platter HDDs will likely be extinct by then.
What is petabyte?
A petabyte is a very large digital data unit that is equivalent to 1,000 terabytes. According to some calculations, a petabyte is equal to 500 billion pages of conventional printed text or 20 million tall filing cabinets.
Traditional data backups, which must scan the entire system each time a data backup or archiving activity occurs, are not appropriate for petabytes. Although traditional network-attached storage (NAS) can handle petabytes of data and is expandable, it might be resource-intensive to traverse the system's ordered storage index.
A typical laptop or desktop computer has 16 GB of random access memory when comparing memory just, not storage (RAM). Up to 6 TB of RAM can be found in a high-end server. Accordingly, it would require 170 high-end servers or about 61,000 desktop computers to build up to one petabyte of RAM.
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