in reply to Append big files

The fastest way under Windows is: copy file1/b + file2/b + file3/b allfiles/b

If you can arrange for allfiles to be on a different device (drive) to the rest -- eg. create it on an ssd -- then it will be quicker than if all the files are on the same device(*).

* not necessarily true if the one device is actually a set of raided multiple drives.

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