[MacDV] Re: 200 gig hard drive vs. dividing hard imac drive

[Thubten Kunga]

FireWire is 50 MBytes/sec (400 bits dIvided by 8 bits per byte) while 
FireWire 800 is 100 MBytes/sec (800 bits dIvided by 8 bits per byte) 
sustained throughput. This is analogous to the old ATA66 vs. the newer 
ATA100 IDE spec. I think that we will be needing FireWire 800 to 
transfer HDDV from our High Definition DV cameras and desks that will 
be coming to market later this year.  http://www.supervideo.com/jvc.htm

Anyone on the list have any experience with High Definition DV yet?

k

On Thursday, January 16, 2003, at 11:08  AM, Michael Winter wrote:

> On Tuesday, January 14, 2003, at 11:57  AM, XXL wrote:
>
>>> The bandwidth for firewire 400 is so much greater than you need for 
>>> dv
>>> capture that there is enough room to pass the video thru the 
>>> harddrive into
>>> the computer and then record it onto the drive.
>>
>> According to Maxtor engineers, FireWire 400 is the limiting factor in
>> performance in many drives now.  It is claimed that newer drives are 
>> faster
>> than the bus. ..just what I read.. Have no idea if it is actually 
>> true.
>
> From the research I've done speccing drives, you're information is 
> correct, at least with respect to sustained transfers.
>
> However what the previous poster was referring to is that a real time 
> video stream has a fixed bandwidth that is much lower than the 400 
> Mbps that Firewire provides. So it doesn't matter how fast Firewire or 
> the drives are, as long as they are faster than the DV stream(s) 
> (which they are -thanks sb).
>
> -Mike