Can a Firewire 400 device read a 800 one? Tags: Firewire Devices Storage Last response: May 13, 2012 4:57 PM in Storage Share midi25 May 13, 2012 2:56:09 PM Hi, I,ve got a FW 400 1394a port on the back of my PC and I want to connect to a FW 800 1394b hard drive. Will this work? Would I just need a FW 800 to 400 adapter to go on the FW 800 device? I think FW 800 can read FW 400. But not the other way round. More about : firewire 400 device read 800 RealBeast a c 317 G Storage May 13, 2012 3:27:55 PM Firewire is BOTH forward and backward compatible but runs at the speed of the slower device. An adapter will work, and you would use the same adapter to go either way -- i.e. any 400 to 800 adapter can be used in either direction. midi25 May 13, 2012 3:37:32 PM That's what I was thinking. But I don't want to buy something without asking someone that knows. I have seen 1.5m 800 to 400 cables on Ebay. I will probably order one of them. I don't mind if the 800 port runs at 400. The 800 port is on my external drive and the 400 is on my PC. If it works I,m happy. It will be cheper than having to buy a FW800 PCI card. Thanks Related resources WTS: Galaxy S4 + HTC One $800 for both MINT CONDITION ($400 separately) - Forum Can't find your answer ? Ask ! Get the answer RealBeast a c 317 G Storage May 13, 2012 3:38:52 PM Yes, the adapter or a specific cable will work, like this one: http://www.monoprice.com/products/product.asp?c_id=103&... edit: and yes it will run at 400 speeds. midi25 May 13, 2012 4:57:33 PM That's the cable I need. I will order one off ebay. Thanks Can't find your answer ? Ask ! Publish Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !