Nolonar Nolonar Sign up or log in Sign up using Google. Liron Yahdav Liron Yahdav 2 2 gold badges 4 4 silver badges 8 8 bronze badges. What does it mean when the Steam Downloads screen says Preallocating? What does it mean when a Steam download says Preallocating?Īsk Question. The best answers are voted up and rise to the top. It gets even worse if that other app is also lacking space, just because your download occupied too much. This is especially important, because you don't want to spend hours downloading a file, just to realize that you no longer have enough space for it, just because another app was also writing. If any other application attempts to fill that space, the OS will report that there is not enough disk space available. By preallocating files, the OS already knows how much space will be occupied. In addition to dly's answer, preallocation is necessary when downloading files, regardless of optimization or performance. Allocating each file separately can cause some delay on slower disks especially with downloads of several s of files download - wait - download - waitinstead of download - download - download. This helps increasing the game's performance like already stated in the comment by Ross Ridge and saves valuable time, because the download won't start when the allocation fails e. Arqade is a question and answer site for passionate videogamers on all platforms.
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