In our previous episode, Mark Morgan Lloyd said:
> capability, but that "thumb drives" have an embedded microcontroller 
> that levels the wear. There is still the issue that some filesystems 
> work better with this type of device than others.
> 
> My experience with external USB-connected drives is that their power 
> demands exceed that of most (internal and external) USB hubs, that they 
> might not describe themselves accurately to the hub, and that in many 
> cases they lack an external PSU socket. In practice, the ports on the 
> back of an NSLU2 "Slug" will drive the notebook-style drives I've got.

I've seen 2.5" usb-only HDD's crash laptops, and my experiences with other
arm devices (Sheeva, goflex are the same).

In short, no devices that don't have an own PSU. 
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