-Capturing or appending an image happens in two main phases: (1) scanning the
-directory or NTFS volume to checksum all the files and determine the streams to
-be written, and (2) writing the new streams to the WIM file. Streams are not
-stored in memory after (1), since there could easily be gigabytes of data;
-instead, they are read again during step (2); however, duplicate streams in the
-image, and streams already existing in any other image in the WIM, are not read
-again. In the future, it may be possible to introduce the ability to capture an
-image with reading each file only one time, although this mode would have some
-limitations--- for example, a stream might be compressed only to be thrown away
-as a duplicate once it's been checksummed.
-