3 Replies Latest reply: Sep 25, 2011 8:54 PM by f1.4
f1.4 Level 1 Level 1 (0 points)

According to apple's FireWire FAQ  found here

 

"Question 7: Can FireWire devices be connected in a daisy chain?

Answer: Yes, and if the devices are designed according to the FireWire standard, they can be turned on and off as needed. For example, all devices don't need to be powered on to use the last device in the chain. For the best result, and to avoid overstressing the FireWire port, connect one FireWire device to the Macintosh, then add one device at a time to the chain. Avoid plugging in live power adapters into devices connected to the chain."

 

However, after trying a LaCie d2 Quadra v3 and having it disconnect with an error after powering off the Lacie Hard Disk Quadra that was in front of it in the chain, I have come to the idea that maybe LaCie is not using chipsets designed according to the FireWire standard. When switching the order of the drves in the chain I obtained different yet still undesierable results. I tested a Maxtor FW 400 hard drive, and it allowed the drive behind it in the chain to mount without it being powered on, and when it was on then ejected and then powered off, the drive behind it was unaffected, so this drive must have been designed according to the FireWire standard.

 

the LaCie d2 Quadra v3 has some major issues that LaCie knows about, so I'm going to write that off as a messed up drive. But the Hard Disk Quadra is supposed to not have any issues, but I can't get drives behind it to mount when it hasn't been turned on, so I'm assuming that the chipset in it was not properly designed according to the FireWire standard.

 

Is anybody else having these issues with these same drives? What about with other brand drives? I'd like to know because I've heard on other posts that some work great and others don't, so I'd like to know which manufactures to stay away from if I plan on daisy chaining their drives.

 

Maybe its like with guitar effects pedals where you have true bypass with a DPDT switch, but not ture bypass with a SPDT switch? Maybe these power switches need to not have true bypass? I don't know and I'm sure that the circuitry of these drive chipsets is way more complex than that.

 

Lets somehow get a list going of FW 800 drives that do allow daisy chain passthrough with their power off.


iMac, Mac OS X (10.6.8)
  • Mrs H Level 2 Level 2 (225 points)

    I have several v2 d2 Quadras and 1 v3.  I was going to put the v3 at the end of a chain I was about to create.

     

    I'm new to daisy chains so did a Google search for info - not necessarily about Macs. I know nothing about this but, it seemed to me I was reading that the drives have to be on for the ones in the series that follow it to work, despite what Apple says in your reference. 

    I even looked at this to see if there were any tricks: http://www.youtube.com/watch?v=FVA6rzaOVqI

     

    I notice that the other drive you tested is a FW 400 which adds something else again to the mix - shouldn't the slowest drive be at the end of the chain to keep the rest of the chain at 800?  Mind you, I don't know how to daisy chain, I've just done some reading - always a dangerous thing .

     

    Regardless, you are saying, it doesn't work???

    f1.4 wrote:

    ...

    However, after trying a LaCie d2 Quadra v3 and having it disconnect with an error after powering off the Lacie Hard Disk Quadra that was in front of it in the chain, I have come to the idea that maybe LaCie is not using chipsets designed according to the FireWire standard. When switching the order of the drves in the chain I obtained different yet still undesierable results. I tested a Maxtor FW 400 hard drive, and it allowed the drive behind it in the chain to mount without it being powered on, and when it was on then ejected and then powered off, the drive behind it was unaffected, so this drive must have been designed according to the FireWire standard.

     

    the LaCie d2 Quadra v3 has some major issues that LaCie knows about, so I'm going to write that off as a messed up drive.

    Can you tell me please to what you are referring here above?

     

    Has warranty covered whatever it is that is wrong with your v3 d2 Quadra?

     

    And finally, off topic, but I'm curious, what is the behavior of LED light on your v3 d2?  It's my only d2 that doesn't have an auto switch and so it's either on or off.  I've only tested it by plugging it directly into the only FW port on the iMac and when the d2 is on, the light blinks even when it's not in use.

     

    Mrs H

  • f1.4 Level 1 Level 1 (0 points)

    I saw that video too, they spell daisy wrong. haha.

    the problem I'm referring to is the sleep and freeze problem lacie is having with the v3 d2, detailed in this support email they sent me:

     

    My name is Michael, and I will be happy to help you with your LaCie product. First of all, I would like to thank you for choosing LaCie, and we appreciate your patience and trust in our products.

    If I understand your issue correctly, you seem to be having an issue is that when the drive goes in the sleep mode and wake up, the system appears frozen and stops responding.

    I would like to inform you that this is a known issue, as there's a lot of customers have reported the same issue, but the good thing is that we raised it to our R&D department so they can search for a workaround to fix this issue.

     

    Unfortunately, we don't have an estimated time to resolve this problem, but we strive to provide you with the best service, so please don't worry as this issue will be resolved very soon.

     

     

    Thanks a lot for your patience with us.

     

    Michael

     

    That wasn't the problem I asked them about. I think that was an auto-response because my message to them had the word "sleep" in it.

    I took the v3 d2 back to where I bought it so I can't tell you about the LED behavior. I'm over LaCie drives. they all require power to be on for the FireWire pass-through to work. I gotta figure out who makes ones that work the same way my firewire 400 drives do with daisy chaining (that is; no power needed for mid-chain drives)

  • f1.4 Level 1 Level 1 (0 points)

    I got an OWC Mercury Elite-AL Pro with a quad interface, and it works how it should. Meaning If i have drives after it mounted and running, I can unmount the OWC and switch it off and nothing bad happens to the ones after it. It's awesome.