I don't really see your logic Luke. External drives have were in the past not recommended for use in video editing due to:
1) Bandwidth limitations of the transfer medium (USB 1.1 once upon a time); and
2) The generally poor specifications of hard drives used in external drives.
Although USB2 is theoretically the match if not the supperior of firewire, the latter method of connection is better suited to large multimedia files. Generally there is no longer an issue of external drives not giving equal perfomance to internals, but you should always take care when chosing a drive to buy.
You'll pay a premium for the luxury of an external disk. And as Mike commented a few days ago, watch out for the increased popularity of external SATA drives. Motherboards are being shipped with external plates for SATA connections, and you can buy PCI expansion cards for bothe internal and external drives. Definately worth investigating.
To the best of my knowledge stating that USB2 HDD are compatible with all NLEs is a bit misleading. If the company supplying the software don't actively support external HDDS, you may find yourself stuck.
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