I just bought a drive and enclosure from newegg (I SHOULD have waited, both are/were on sale this week, oh well), and the external is eSATA+USB2. From what I've read online is that if you want to use the plug and play feature you need to set your SATA interface from whatever it was to AHCI. My question is, can I do this safely at any time? For instance, my boot drive is a SATA drive that was originally installed in IDE mode.