it is general... the windows recognizes the SATA contriller of A8N-E (And many others...) as removable...
but u wont be able to remove it obviously because ur OS is running... so no problem...
I have installed the Windows XP in New SATA-2 160 GB Hdd.
And the Windows partition and other three partitions of the same Hdd are shown as Safely removable drives!!!