There's also the fact that the original Xbox consoles all had hard disk drives, so the unseen caching area might be important there, too.
(By the time in 2010 when "USB support" allowed usage of USB flash drives that were a lot larger than the original Memory Units, Microsoft had also already announced the impending shut-off of Xbox Live for original Xbox titles, and the Backwards Compatibility
list hadn't been updated in ~2.5 years.)
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