"Win ME came out around August 2000, and as part of Microsoft's plan for: "World Domination by the NT kernel" they decided to remove all real mode DOS support. The "removing DOS" concept included removing the /s option from the format command. In place of having the ability to format a floppy with system files already on it, Microsoft has only left you the ability to make a "Windows Recovery Disk" under Win ME. Win ME ( and 98SE) even include an ERD.cab file as part of the transition to having a "recovery disk" instead of real mode DOS. ERD is short for Emergency Rescue Disk, and it used to be one of those nifty options that were included on the Windows CD that almost no one ever really used."
FULL STORY @ LITTLEWHITEDOG (http://www.littlewhitedog.com/reviews_other_00017.asp)