These are just a couple of examples as to why progress bars aren't the most reliable things in figuring out how long something is going to take or how far ahead you've gotten. There are other reasons as well of course, like how in some cases smaller with older harddrives, smaller files take longer than bigger files in many cases because of the delay in the mechanical stopping and starting of reading and writing to disks. It will look like nothing is happening while it's copying that one big file, but once it's done copying it and moving to the next file, the program fills in the blank for that whole piece which totals 400/500 in one go. So if we then imagine the install is 500mb and most of the files are 1mb, but then there's also this big big file that's 400 mb. So you have 500mb to install and you divide the bar up into one little piece per megabyte. In some cases this goes for the amount of space the files take up. So if the program was installing 500 files, the bar would be divided into 500 small parts and it would fill up one by one as each file finished copying. In "ye olden days" it was simply a division of how many files you were transferring for instance. Depends on how the progress indicator is programmed.
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