Dropped Frames in Viewer, and Hard Disk Questions

Hi,
I'm new to FCE (v3.5.1) having just upgraded from iMovie. I'm on a 2GHz Core Duo MacBook with 2GB RAM. I have a 120GB internal drive that has 16GB free. In my initial use of FCE, I've run into two problems.
(1) I'm finding that frames are regularly dropped during playback in the Viewer - as much as half the time. The same video clips playback flawlessly in iMovie and in Quicktime. These frames are on my MacBook's internal hard disk and are each roughly a minute in length.
I should note that these clips were exported from iMovie (I copied them out of an iMovie project file / package). Might this be causing the problem?
(2) Also, I'm finding that the audio playback of these clips (that were copied from the iMovie package) is okay in the Viewer but not in the Canvas (I hear beeping) -- I found mention that the audio format of iMovie and FCE are different, so I expect I need to reimport these clips anyway. Is there an easy way around this?
(3) I know I said two problems, but number 3 is a question, not a problem! Given my hardware setup described above, should I be able to get away with working with the clips located on an external Firewire hard disk? Or should I only work with clips located on my internal drive. Similarly, can I effectively work with a scratch disk that is external FW, or should I keep that on my internal drive?
Thanks in advance,
Tim

(1) I'm finding that frames are regularly dropped during playback in the Viewer - as much as half the time. The same video clips playback flawlessly in iMovie and in Quicktime. These frames are on my MacBook's internal hard disk and are each roughly a minute in length.
Need to know info more about the clips from iMovie.
Clips coming into FCE need to match the Sequence settings. This is set up before a Project begins using the Easy Setups. My guess is there is a mis-match.
2) Also, I'm finding that the audio playback of these clips (that were copied from the iMovie package) is okay in the Viewer but not in the Canvas (I hear beeping) -- I found mention that the audio format of iMovie and FCE are different, so I expect I need to reimport these clips anyway. Is there an easy way around this?
The work around is to render, Command+R or Sequence>Render All from the menu.
iMovie uses DV Stream and is a multiplexed format whereas FCE uses DV. The QuickTime files that FCE likes has the audio seperate from the video allowing them to be edited with or without the video.
3) I know I said two problems, but number 3 is a question, not a problem! Given my hardware setup described above, should I be able to get away with working with the clips located on an external Firewire hard disk? Or should I only work with clips located on my internal drive. Similarly, can I effectively work with a scratch disk that is external FW, or should I keep that on my internal drive?
Using FCE an External firewire is a much better option than your internal.
Search this forum for Canon/LaCie, most users get in strife with this combo. Most other stuff seems fine.
Before unloading $$ it's always best to do a bit of checking around.
Al

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