"For all video and audio files: Any file under approximately 3 to 5 seconds may be a problem. If they are too short, there may be unwanted results in some control modes. The 000 loop / ambient file should in most cases be longer. A longer loop file will allow your SD card to last longer. A short file looping continuously reads a small area on the SD card. A long file stored across more bytes of the SD results in less reads per byte over time. All SD and USB have a MTBF rated average number of reads. This number is very large, but in an application that runs all day, every day, this will add up. If you make the 000 loop file 10 times longer, your SD card should last 10 times longer as well. Keep in mind that if you are using one of the Trigger Delay settings, your trigger file will not play until the end of your 000 loop file. Most users will never have an issue with a file that is too long. The time limit for the length of any file depends on the file encoding and bits used per second. Lower bitrates, lower frame rates and reduced pixel size can increase the time allowed. The file size is normally limited to 4 GB. Larger files may be stored on the SD card or USB drive if it is formatted to NTFS. The maximum SD card size for the Sprite is 128GB. The USB port will support up to a 2TB USB hard drive at USB2 speed. " ---Quote from "DV-S1 Sprite Manual revision 4.00 for firmware version 20210416" (Source: medeawiz.com/Downloads.html)