Tom's Hardware > Forum > Storage > General Storage > [Solved] Firewire Daisy Chaining

[Solved] Firewire Daisy Chaining

Forum Storage : General Storage - [Solved] Firewire Daisy Chaining

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Best answer from Mekugi Ana.

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wildwell   10-11-2009 at 01:31:14 AM

If I have a firewire daisy chain starting with IEEE1394b (FW800) for the first couple of devices (hard drives) in the chain and then switch to IEEE1394a (FW400) after the first two devices, will the whole chain drop to 400Mbps or just the devices after those first two hard drives? Thank you.

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Best answer from Mekugi Ana

wildwell wrote :

If I have a firewire daisy chain starting with IEEE1394b (FW800) for the first couple of devices (hard drives) in the chain and then switch to IEEE1394a (FW400) after the first two devices, will the whole chain drop to 400Mbps or just the devices after those first two hard drives? Thank you.



Unfortunately adding a FW400 device to an FW800 chain drops the whole chain to 400. Communication on all daisy chains is always dependent on the devices connected, which means they all have to agree on the method. Since a FW400 device can't understand the FW800 protocol, everyone brings the conversation down to least common denominator.

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Mekugi Ana   10-12-2009 at 09:09:08 PM
Best answer

wildwell wrote :

If I have a firewire daisy chain starting with IEEE1394b (FW800) for the first couple of devices (hard drives) in the chain and then switch to IEEE1394a (FW400) after the first two devices, will the whole chain drop to 400Mbps or just the devices after those first two hard drives? Thank you.



Unfortunately adding a FW400 device to an FW800 chain drops the whole chain to 400. Communication on all daisy chains is always dependent on the devices connected, which means they all have to agree on the method. Since a FW400 device can't understand the FW800 protocol, everyone brings the conversation down to least common denominator.

------------------------------ -Mekugi Ana
:: Only Science is more interesting to me than Tech ::
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wildwell   10-12-2009 at 10:21:21 PM

Dammit. Oh well, I'll just order some more cables and have an FW800 chain and an FW400 chain. Thanks.

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