NTFS File Streaming is a technology that gives applications the ability to access files that are saved on an NTFS drive even when the volume itself is not online. Applications that need to temporarily read or write data from an NTFS volume without having to wait for the file system service layer (FS Layer) on which the VolumeMountPoint resides can use this feature. Applications that access legacy systems that did not always implement FS layers can also use this feature.