Sync

In some cases, Windows might cache data before writing it to the disk. When a computer is shut down normally, all cached data is written to the disk. If you plan to shut down a computer forcibly (by initiating a Stop error or disconnecting the power), you can run the Sync command to flush all file system data to the disk. Sync is also useful to ensure that all data is written to removable disks.

You can download Sync from http://technet.microsoft.com/en-ca/sysinternals/bb897438.aspx. The simplest way to use Sync is to run it with no parameters and with administrative privileges, which flushes data for all disks.

sync

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

  Flushing: C E F

To flush data for the F drive removable disk and then eject it, run the following command.

Sync -r -e F:

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

  Flushing: F