We recently had a job that required the use of SDI - our method of acquisition was to take the SDI out of a deck into our FCP suite (5.04).
The thing that caught me by surprise was that it actually spooled and not only that, but it spooled slowly - approx 4secs to go through one minute of footage (as a guide Sony SR deck does approx 1sec per minute of footage).
Are we doing something wrong? or is it just like this?
i never tried using HDSDI in FCP, but i did try using the RS422/HDSDI method in media100, and it works beautifully. are you using RS422? are you able to change your preroll time in FCP? i set mine to 1 second in M100. make sure youre not using firewire control