The hash function is an algorithm that will map data of variable length into a fixed length, which means the variable length file will be converted into a 256-byte string (in this case) and sent to the server. If the file fits into one block, the client side hashes the file.The reason being-Dropbox stores files in blocks of 4 MB. If it is 4 MB, the file needs to be broken into smaller units of 4MB. Dropbox will check the size of the file.When you wish to upload a file which is 4 MB, here is what happens at the server side. These edited files will be automatically updated into individual folders. The Dropbox server will store the files with the relevant changes. The network connection is peer-to-peer, but in case you want to share files with your friend, it is not mandatory that both of you be online. Amazon’s S3 is a web service interface that provides storage for Internet users. These files are then encrypted and stored in Amazon’s Simple Storage Service (S3) in different data centers across the United States.Once the file is saved, it is synced to their online servers.You will drag-drop the file that you wish to store to the designated folder in your account, or copy-paste to the respective folder.
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