Bus powered external Firewire drives

Most portable external drives are now bus powered, many don't even have a power input.
I wonder how many bus powered Firewire driives I can daisy-chain. Where should I place them, at the beginnig, in the middle, or the end of the daisy chain.
I have several powered Firewire drives including my Time Machine Drive.

tommmy wrote:
Most portable external drives are now bus powered, many don't even have a power input.
I wonder how many bus powered Firewire driives I can daisy-chain.
Use a powered Firewire/USB hub so there is enough power to power the port powered devices.
What happened is port powered devices are cheaper and many people opt for the lower price than the ones with their own power supplies, so it creates a problem and computer makers had to turn off ports drawing too much power from the comptuer, so people have to run out and get powered hubs.

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