From: Alan Friedman <alan@greatarrow.com>

Date: April 25, 2005 1:17:35 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] No space?? - use an external drive

Milton -

That is interesting to know.

I usually offload all streams to a desktop or portable firewire drive as soon as I have processed them (or at least evaluated them) and try to keep 10 gigs free on my laptop. I have a first generation Titanium G4 powerbook and I am proud to still be using it (happily) while I wait for a G5 laptop to be introduced. I used to love getting a new computer - now I love trying to keep my old one usable for as long as I can.  8^)

60fps is a disk muncher for sure!!  I'm going to learn to live with 8bit and 30fps - for now, anyway...

Alan

On Apr 25, 2005, at 2:33 PM, milton_aupperle wrote:

Hi Folks;

For those of you with very little disk space left - you might want to

consider recording directly to an external USB 2 /

FireWire hard drive - if you hvae one.

For 640x480 30 fps streams of 8 bit video, Astro IIDC  requires

sustained transfer rates of 9 megabytes per second and uses 9

megabytes of the theoretical 31.25 FireWire 400 total bandwidth.

A USB 2 hard drive can keep up with this pretty easily (no competition

for bandwidth on disimilar busses) and so far, I've had absolutely no

problem witha FireWire 400 drive either. I daisy chained them together

so that the drive was attached to the Mac and the camera was attached

to the hard drive and it did not drop a single frame at 30 fps while

recording.

At larger video sizes or faster frame rates (the PGR Flea cameras can

deliver 60 fps at 640x480 in 8 bit), you'll either have to use USB 2

or add another FireWire bus (PCI for desktop or CardBus for laptops) 

as there is not enough bandwidth available on a single

FireWire bus to do both.

Hope that helps..

Milton J. Aupperle

President

ASC - Aupperle Services and Contracting

Mac Software (Drivers, Components and Application) Specialist

#1005 - 815 14th Avenue. S.W.

Calgary Alberta Canada T2R0N5

1-(403)-229-9456

milton@outcastsoft.com

www.outcastsoft.com

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