![]() Dropbox splits files into chunks, called blocks, up to 4MB in size. Magic Pocket is our system for storing files. We refer to data that’s accessed frequently as “warm” and infrequently accessed data as “cold.” The differences in access characteristics between warm and cold data open up opportunities for cost optimization by tailoring the system to each class of data. In general, people are much more likely to access files they have recently uploaded rather than files they uploaded years ago. Users also tend to share new documents, so a file is also likely to be synced to other devices soon after upload. A new upload triggers a number of internal systems that fetch the file in order to augment the user experience, such as perform OCR, parse content to extract search tokens, or generate web previews for Office documents. Over 40% of all file retrievals in Dropbox are for data uploaded in the last day, over 70% for data uploaded in the last month, and over 90% for data uploaded in the last year. ![]()
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