Although TrialDirector is NOT designed for early case assessment, if you have the software, it can be used in this process but you will need to have IT copy the data you wish to assess onto separate hard drives so as to not interfere with the data in its original location. This is not a process to follow if this is a large data case.
But you can import the data into TD in particular and then use its search features and coding features on the copy of the data you have had made.
The advantage of using it in a small case is that you already own the software (assuming you do) and after your assessment of the data, the data is already in your trial presentation program ready to be used if you go to trial.