eMule
Lets say I want to share a semi large file, 144MB and I have a 30K connection and 16 people are wanting the file. eMule will break this file into 16 parts of 9MBs each. Now, instead of uploading the entire file to one person at a fast speed, I upload to about 8 users at a slower speed. Each of these people should be downloading a different part of the file. Once these initial uploads recieve 9MB, I send them back to the queue and start uploading to the other 8 users. Since those first 8 users recieve 9MB (or a complete chunk), they now start uploading that chunk to everyone else wanting the file. When the second set of 8 users finish downloading 9MB, they are put back on the queue. Now, if everyone downloaded a different 9MB chunk from me, I have just uploaded 16 chunks (The whole file) into the network and could even unshare the file since I also now have 16 users helping me share it. Now, this means that everyone gets the files slower, but they ALL get the file even if I leave the network.. So, lets say after uploading 300MB of the file, I disconnect. Then after I disconnect, more people want to download that file. Although there isn't anyone in the network with the full file yet, they can still get it because they find the 16 other sources of that file still on the network. Then they themselves quickly become sources for others that want it.
Other networks
Again, I want to share a semi large file, 144MB and I have a 30K connection and 16 people are wanting the file. I start uploading that file to one of the people wanting the file. This persons downloads at pretty fast speed.. But, when he finishes the download, he disconnects so he can use it. I upload to the next person real fast and he completes it. He stays on a bit and begins to share it to one other users. I also begin to upload to the next user.. But I disconnect at 300MB.. This leaves only one person able to share that file in the network and this person doesn't stay on long either since he has the complete file. Now, only two people got the whole file, and 2 others only have part of the file. The file is now dead to the network and nobody else can get it.
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