As our group’s file systems expert, I see most of the common problems associated with the use/misuse of NTFS compression. Before you check the “Compress contents to save disk space” checkbox, it might be good to understand how this affects the happy little bits, bytes, & nibbles running around on the disk.
Often backup applications receive ERROR_DISK_FULL errors attempting to back up compressed files and this causes quite a bit of confusion when there are still several gigabytes of free space on the drive. Other issues may also occur when copying compressed files. The goal of this blog is to give the reader a more thorough understanding of what really happens when you compress NTFS files.