Hi Jason.
Just to answer your questions.  I have both a firewire 400 and an 800  
port at the back of the imac.  The drive only has an 800 port although  
it does have two ports to allow for daisy chaining.  No difference in  
terms of response with the cable in either of the 800 ports on the  
drive itself.  The drive does have an external power source so I am  
not sure whether it's a good idea to unplug that and try to let it run  
on the firewire alone.  Essentially if it's any use to you this is the  
listing for it on amazon:
http://www.amazon.co.uk/gp/product/B000W9Q2EW/ref=s9alfla_c6_flshimg2-rfc_p?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-6&pf_rd_r=0T52QQKMQGASSHY3D7DV&pf_rd_t=101&pf_rd_p=220563091&pf_rd_i=163514031

Unfortunately I have no other firewire 800 devices to hand to test the  
cable and imac 800 port connection on.  I do have an adaptor which  
allows a male fw 400 plug to be inserted into a female fw 800  
connection.  I know my fw 400 port on the imac is working because I  
have a set of Lacie speakers connected to it,  and the system profiler  
sees the speakers but it doesn't see the drive.  I plugged a 400 cable  
into the 400 port on the imac and plugged the 400 to 800 converter on  
the other end and inserted it into the external drive which caused it  
to behave as if it was constantly restarting itself for want of a  
better way to express it.   Not thinking this was a good thing to have  
carrying on I powered off the computer and then turned off the  
external drive using its power button.  anyway that's how things stand  
at the mo'.  Incidentally, what is the power manager and where can I  
locate it?  Secondly, what are the options if the firewire 800 bus  
isn't behaving as you say : supplying power but without data  
capability?  I'm no longer in warranty so am I facing a hefty bill?   
I'm a bit loath to do too much experimenting with the drive as it has  
my entire aperture library on it which I haven't yet stored in a vault  
- I know a cardinal sin.

Sorry to go on.


Jonathan Brady
Photographer
tel: +44(0) 7931 541 489
web: www.jonathanbrady.net
email: [email protected], [email protected]




On 12 Jan 2009, at 19:03, Jason Davies wrote:

>
> Jonathan Brady wrote on 11/1/09 at 21:40
>
>> hey there. small problem with firewire seems to be occurring. i have
>> a western digital firewire/mini usb external hard drive which i have
>> connected to my imac with a firewire 800 cable - not daisy chained.  
>> up
>> until today , the drive has been working fine with my imac. however,
>> now the drive is not being seen by the imac when the firewire cable  
>> is
>> connected. if i turn off the drive, unplug the firewire and then plug
>> in the drive using mini usb it operates properly albeit at a much
>> slower rate given the connection. i know this could mean i just need
>> to replace the firewire cable but is there anything else mysterious  
>> it
>> could be? I have unplugged and turned off the drive umpteen times  
>> with
>> different variations of order in terms of the connection of the
>> firewire cable but it doesn't seem to make any difference. apple
>> system profiler doesn't see the drive but does see my firewire lacie
>> speakers which are connected via the 400 port. any suggestions or is
>> it troubleshooting time?
>
> try a different user? does power still travel down the port and
> cable? I once had a FW connector lose data ablity but continue
> to provide power, many years ago. It does sound like you should
> check the cable before assuming anything else.
>
> Just to be absolutely clear - is the FW 400 a completely
> different port or is attached via an adaptor?
>
> I would also reset the power manager as that often fixes iSight
> bus problems - not identical , but not dissimilar either...
>
>
> >


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