JSI Tip 9354. Sync.exe freeware flushes all file sytem data to disk.

Download Sync.zip and unzip it.

Sync.exe is a command-line application that insures that all pending writes are written to disk.

When you type sync /?, you receive:

Sync 2.2: Disk Flusher for Windows 9x/Me/NT/2K/XP
Copyright (C) 1997-2004 Mark Russinovich
Sysinternals - www.sysinternals.com

usage: sync \[-r | drive letters\]
   -r   flush removeable media
   -e   eject removeable media

Specifying explicit drive letters will flush only those drives.