From: "milton_aupperle" <milton@outcastsoft.com>
Date: April 25, 2005 12:33:13 PM MDT
To: Astro_IIDC@yahoogroups.com
Subject: No space?? - use an external drive
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