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What shall we download today?
What happens if I cancel a download? How can I resume? I just installed BitTorrent but whenever I click on a link I just get a small file and nothing happens? This and much more you can find the answer to at this site
What is BitTorrent
BitTorrent is a protocol designed for transferring files. It is peer-to-peer in nature, as users connect to each other directly to send and receive portions of the file. However, there is a central server (called a tracker) which coordinates the action of all such peers. The tracker only manages connections, it does not have any knowledge of the contents of the files being distributed, and therefore a large number of users can be supported with relatively limited tracker bandwidth. The key philosophy of BitTorrent is that users should upload (transmit outbound) at the same time they are downloading (receiving inbound.) In this manner, network bandwidth is utilized as efficiently as possible. BitTorrent is designed to work better as the number of people interested in a certain file increases, in contrast to other file transfer protocols.
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Why is my downloaded file huge even though I only downloaded a small bit?
When BitTorrent starts, it allocates space for the entire file(s). That is what you see at startup as the progress bar moves across the screen and the disk drive goes crazy. The reason it does this is because it downloads the file in pieces, and those pieces arrive in an arbitrary order. Unlike http or ftp, which download the file from start to finish, BT downloads it in random order.
Why does my hard drive go crazy at the beginning of a resumed download?
When you open a torrent and give BitTorrent a filename/directory that already exists, it must check the file to see how much of it is useful data and how much is junk. (Recall that BT allocates space for the entire file when you first start a torrent.) To do this it must read the entire contents of the file, and generate what's known as a hash for each piece of the file. A hash is a cryptographic function that creates a small summary or digest of a large amount of data. BitTorrent uses the SHA hash function to determine which parts of the file are good and which are bad.