The effect of the "Reserve space" option on copying

[kmikita]

Version

Double Commander Version: 1.2.0 alpha Revision: 10951 Commit: 9bb0aea51 Build date: 2023/10/03 Lazarus: 2.2.4.0 FPC: 3.2.2 Platform: x86_64-Linux-gtk2 OS version: Ubuntu 18.04.6 LTS

Widgetset library: GTK 2.24.32

Description

When copying to destination file systems that do not support fast allocate, "Reserve space" performs full prewrite, which doubles the operation: first, the file is written entirely with zeros, and then only with data. This is critical on slow devices or with a limited rewrite cycle (i.e. USB-flash storages with FAT32). It is better that the "Reserve space" flag will be ignored if fast allocate is not supported.