Firewire 800 to 400 adapter

That adapter will work, it is the same thing ie, one end of the cable is FW400 and the other is FW800.

Firewire doesn't have a "direction" so as long as the cable fits, it will work.

As for power, don't worry about it as long as you don't use the mini 4-pin connector. FW800 has more pins for data, they have the same power pins and those pins get translated in the adapter.

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I don't think you can make an adapter to plug in a FireWire 800 device into a 400 port. I believe FireWire 800 has at least 1 additional set of pins which would make if possible to make an adapter to plug a 400 device into an 800 port but not the other way around.

macstatic said:

I'm looking for a way to connect an external bus-powered Firewire 800 hard drive (Glyph Portagig 800) to an iMac which only has Firewire 400 ports, and still powering the drive through just the Firewire connector.

All I've found are Firewire 400 to 800 adapters, allowing Firewire 400 peripherals to be connected to computers having only Firewire 800 ports. I need the opposite of course.
Where can I get such adapters, and without sacrificing bus-power?

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The easiest way it would seem rather than using an adapter is to replace the existing cable with a FW800 to FW 400 cable. They are commonly available and will work in either direction, as per the first three listings on this page (just one of the first search results in Google- they are available at tons of places):

http://www.cwol.com/firewire/firewire-800-1394b-cables.htm

kornyboy said:

I don't think you can make an adapter to plug in a FireWire 800 device into a 400 port. I believe FireWire 800 has at least 1 additional set of pins which would make if possible to make an adapter to plug a 400 device into an 800 port but not the other way around.

Click to expand...

The extra pins may indeed be true, but that only means that it obviously will only work at FireWire 400 speeds in either direction, which is not a problem for the OP's needs. In other words, the FW800 will have all the FW400 pins carried through with no connections to the additional FW800 pins.

kornyboy said:

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I don't think you can make an adapter to plug in a FireWire 800 device into a 400 port. I believe FireWire 800 has at least 1 additional set of pins which would make if possible to make an adapter to plug a 400 device into an 800 port but not the other way around.

Click to expand...

Yes you can. The adapter has no direction. I have a FW800 disk connected to a FW400 Cube. It just works at 400 speed.

The adapter only matters for what cable you already have. If you have a Firewire 800 cable and not a Firewire 400 cable, then yes, you are right, that adapter won't work. But if you have a Firewire 400 cable now it will work perfectly with that cable.

Years ago I bought 3 Belkin Firewire 800 to 400 cables in a bulk lot off of ebay. I am using one now to connect my OWC firewire case to my Mac Mini. All it is is a cable with an 800 male connector on one end and a 400 male on the other end. That sounds like just what you need.

I see they are still overcharging with a $39.99 MSRP now.

http://www.monoprice.com/products/p...=10301&cs_id=1030105&p_id=3542&seq=1&format=2

$4.50. Have a nice day.

Here is one that's cheaper. Edit: not as cheap as the one right above! Too slow.

All you need is a male/male FW800/FW400 cable, as specified. Get a length that'll let you connect the drive to the iMac (i.e., make sure it's long enough). As many have said, this is all you need. You'll replace the cable you have now with the new 800<->400 one.

It works quite well.

macstatic said:

Cube: Which adapter did you get, and where did you buy it?

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http://www.granitedigital.com/firewire1394genderadapters.aspx

I got the 9 to 6. I don't use bus power.

cube said:

http://www.granitedigital.com/firewire1394genderadapters.aspx

I got the 9 to 6.

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Of course, if you can score a new cable for under $5, there's no need for a $20 adapter, unless the cable is too difficult to rerun.

jsw said:

Of course, if you can score a new cable for under $5, there's no need for a $20 adapter, unless the cable is too difficult to rerun.

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A Granite Digital 3ft. 6 to 9 cable costs $40.

cube said:

A Granite Digital 3ft. 6 to 9 cable costs $40.

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Did you miss my post? $4.50 for a 6ft 6pin to 9pin cable, or they have a 10ft for $6.12. Almost 1/10th the cost of Granite Digital, and I use many of Monoprice's cables (for everything, including 1080p video and external hard drives) and they all work great.

crazzyeddie said:

Did you miss my post? $4.50 for a 6ft 6pin to 9pin cable, or they have a 10ft for $6.12. Almost 1/10th the cost of Granite Digital, and I use many of Monoprice's cables (for everything, including 1080p video and external hard drives) and they all work great.

Click to expand...

Have you ever seen a GD cable? If you did, you would realize how pathetic those cheap FireWire cables sold everywhere seem. I don't like using cables without ferrites for my drives.

cube said:

Have you ever seen a GD cable? If you did, you would realize how pathetic those cheap FireWire cables sold everywhere seem. I don't like using cables without ferrites for my drives.

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Using ferrite cores is irrelevant with short cable lengths for digital transmissions under normal conditions.

Well, a quick Google search led to one right off the bat from a company in Apple's Macintosh Product Guide called Synchrotech. If you look at the bottom of the following page at the black one it meets your specs and they call it a "CAB-FW8-9-6-CONV FireWire 800 IEEE1394b 9pin (female) to 6pin (male) Converter Plug". It can been seen and ordered at FW 400 M to FW800 F Adapter for $11.00 and though we don't know where you are, they show worldwide shipping.

I know I sure would not be dealing with a place like you mentioned that won't even give you costs when there are other places like this. BTW- if you want to check out more search results, just Google "male firewire 400 to female firewire 800 adapter". Another listing for a shorty adapter cable (19") that meets your specs is 19" Adapter cable but it is $18.50.

BTW- I don't think the weight part of the argument is going to fly when discussing using a commonly available cable instead though- I just weighed one of my 6 foot fw400->fw800 cables that I have laying around on my postal scale and it only weighed 2.6 ounces!! Your choice though- and I hope this other info helps out.

cube said:

Have you ever seen a GD cable? If you did, you would realize how pathetic those cheap FireWire cables sold everywhere seem. I don't like using cables without ferrites for my drives.

Click to expand...

So add a couple of ferrite cores if it's such a big deal.

Mindflux said:

So add a couple of ferrite cores if it's such a big deal.

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It's not just the ferrites, the GD cables are also a thicker gauge and can have a diagnostic LED in those with at least 1 FW400 connector.

cube said:

It's not just the ferrites, the GD cables are also a thicker gauge and can have a diagnostic LED in those with at least 1 FW400 connector.

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Not to nitpick, but a thicker gauge really isn't going to help a digital transmission, for anything other than 'making it feel heavy duty'. The LED can be a nice feature, I guess, if you aren't sure if you are fully seating your cable when you push it in (?)...

But I guess that's why Monster cable is still in business...

firewire question...

I have one of those 400 to 800 cables BUT it doesnt seem to supply power to my device... I am trying to use a ALESIS MULTIMIX FIREWIRE and it cant be seen in system info. a google search turned up that this 400 to 800 cables do not supply enough power for the imac to recognize some devices. what do I need to resolve this issue?