i have never found a project where i had to (as in HAD TO) save 25+ minute video files. even in long takes, it usually makes more sense to split and splice. big files are clumsy and, especially if you are going to edit them later, very very VERY bad for your workflow.
take the time to decouper (as in french for cut up) your material and name it properly. the time you invest in this initial stage will be paid back 20-fold: you will get to know your material better, you will force yourself to work in an orderly fashion, you will examine and precut all your footage in that beautiful organ you have placed above your mouth and beneath your baseball cap (aka The Brain), so on and so forth.
when you look at the timeline, the clipnames will help you understand the cut. when you look at your bin, you will know how many times (if at all) you used that specific scene. as opposed to 38 references to clip 000001.mov
and, in 10 years time, when you go back, you will love yourself (or whomsoever took the time to properly precut and name all the footage) for having all of the names meaning something (jack falls from tree is much clearer than 45 minutes of clip 000001.mov).
this isnt a workaround, it\s just a safe method for editing and organization which will avoid that uou (and your software) run into this type of problem.
why are you losing your time with minidv footage for anyway? i hope that it is historical material and that you are not shooting minidv in this day and age, otherwise i guess you deserve to have this type of problem. LOL
oh yeah, and, if you arent going to use FCP, and have opted for the CS5 suite, why not just save lots of money and use a PC? you really shouldnt be happy with your machines. or should i say with YOUR CHOICE of hardware – software combo?