Seems it was 2000: http://www.cs.toronto.edu/~simon/howto/win2kcommands.html http://www.cs.toronto.edu/~simon/howto/win2kcommands.html It definitely worked on

Seems it was 2000: http://www.cs.toronto.edu/~simon/howto/win2kcommands.html http://www.cs.toronto.edu/~simon/howto/win2kcommands.html It definitely worked on the boot partition at least on XP, not sure about 2k. If it can’t lock the drive it schedules it to be done at boot time (similar to on-boot chkdsk).