No - what I'm saying is - the Toshiba camcorder doesn't actually seem to record in a standard AVCHD layout and container.
An AVCHD capable camcorder will actually store a hierarchy of folders, and deep within the folder structure there will be a folder containing .mts and .m2ts streams. These camcorders can have their footage imported and auto-converted by FCP, iMovie and FCE - but the files MUST remain within their folder hierarchy otherwise these software packages will not operate with them properly.
Your Toshiba doesn't seem to record according to this standard (as the Toshiba, according to what I've read about that camera as well as what you've said, records to an AVI container - which means that, as you've noticed, FCP may not like it (well, obviously does not like it

).
So, what I had suggested was to use Handbrake or MpegStreamClip to convert the footage from AVI into a .mov or .mp4 container.
In terms of a muck about camera, if you want more compatibility with FCP, I'd suggest getting an AVCHD camcorder like a Canon HF or Sony HDR series or something.
Apple has a listing of tapeless camcorders that are supported by FCP, unfortunately, I'm having trouble locating the link - here's a link for FCE (which, if it's supported by FCE, it's supported by FCP):
Final Cut Express: Camcorder support