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Steam reserves every file's full size before downloading. On a portable SD card the app reaches through Android's FUSE layer, fallocate is rejected and the reservation can take tens of minutes for a large game, with nothing downloaded. A new experimental setting (Steam > storage, off by default) makes the session preload answer plain fallocate/posix_fallocate requests on the selected library with success and leave the file untouched, so Steam goes straight to the download. Hole punching and other fallocate modes still pass through, as does every other device. A full card shows up as a disk write error during the download instead of up front. Storage diagnostics behave as before and log the skipped calls.