1 - Data logging uses the file system of the volume on which the file is saved. Meaning that if the file is recorded on FAT32 then its maximum size will be 4GB (limitation due to the FAT32 system), if it's recorded on an NTFS volume the size limit will be fixed only by the amount of free space left on the hard drive. 2 - My estimate considering the file size after 8 hours (considering a 50% bus load) is around 2.6GB. 3 - BM filtering is applied at the firmware level. Therefore the filtering options will apply to both display and data logging. 4 - Yes you can monitor and use the monitor triggers and filters on the playback data.