Make sure you are executing the DISKCOPY command under a CMD.EXE shell. Command.com is the old 16-bit DOS command line, it does not work properly with some newer features.

The Windows Command Prompt can be a little intimidating if you didn’t grow up using DOS — and even then, it’s been long enough since DOS was relevant that you may have forgotten. Below we’ll cover ...

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Editor's take: Back in the DOS days, real PC users wrote their textual tomes in the official MS-DOS Editor – I certainly did. These days, developers offer a confusing array of text editors, so ...