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This is only a part truth-the DSi and XL are region locked only for DSi-Enhanced games. The vast majority of DS games are normal ones that can be played on any DS system (apart from the Chinese one). There aren't many DSi-Enhanced games around, but there are some notable ones such as Pokemon Black and White.
When you try to run the chkdsk /f or chkdsk /f /r command on a shared cluster drive, Chkdsk may not run and may state that the drive could not be locked for exclusive use.