Thank you both for your help however I"m still just a bit confused.
I use two different cameras for video. A small point and shoot and a helmet cam both shoot HD video.
So far when I download off the cameras I have everything both stills and video go into Iphoto.
Yesterday Imovie scanned and imported all my video from iphoto to imovie.
I"m assuming I now have double the space taken up by having movie files in both iphoto and imovie? OR what is showing in Imovie are not the actual large files but only "clips" or something like that??
I do have an external hard drive....not sure what you mean by needing a firewire??? Should I store everything both pics and vids on it and only access the hard drive when I need to work on something??? and if so how do I do it??
Thanks for your patients with a newbe....
As your point-and-shoot camera and your your helmet camera most probably use some kind of compression to save storage space on the device, iMovie will convert those files to video using another codec, that is meant for editing, and which takes up more HDD space.
The codec iMovie uses is called Apple Intermediate Codec (AIC), look
here for file size and some other info about it.
Firewire is an interface like USB or eSATA to connect peripheral devices to your computer.
USB and Firewire is currently implemented in all Macs, except the Aluminium MacBook 13" (not Pro) and the white Unibody MacBook introduced in 10/2009, which do not have Firewire.
To edit properly, one should always use an external HDD (Hard Disk Drive), as the constant access to the video files while editing or viewing material in iMovie puts a lot of strain to any HDD. If you use the internal HHD where the Mac OS X resides, you will get slowdowns, due to the OS (Operating System) also accessing the internal HDD from time to time.
Thus an external HDD is recommended and Firewire is the best current interface for that, as it allows the data throughput without any hiccups, something USB is not quite equipped to.
We are talking about 7 to 14 and more MB/s here, and that is a lot of data.
If any of my information is hard to understand, feel free to ask. Editing and the surrounding technical terms and requirements can be a little hard to grasp, as any other technical or specific field of interest.
Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.
http://www.apple.com/support/switch101/ - text
http://www.apple.com/findouthow/mac/ - videos
http://www.apple.com/support/mac101/ - text
http://support.apple.com/kb/HT1343 - keyboard shortcuts