Is the NTFS compression setting ignored by some applications

compressionntfs

I use NTFS compression on some folders, I understand the pros and cons of this, but for my use case it is preferred.

I have noticed some odd behavior for many years. Some applications do not "honor" the directory compression flag.

I have never been able to determine why this is so. I'd like to understand the reasons and if there is any way to "force" and application to honor it.

Currently I just use a batch that runs compact from time to time on the required folders.

Best Answer

  • Do you mean that the compression checkbox is unchecked altogether?

    Probably what's happening is that those applications are creating files somewhere else then moving them into the destination folder. A move on the same partition won't force the compression to be applied because of the new parent.