Why did the camera create multiple files when I recorded for a long period of time?
The camera starts recording to a new file approximately every 4GB. Subsequent files in a single shoot will be named with the ‘NX” replaced by 01, 02 etc. For example if the first file in a 16GB single recording is IONX0001.MP4, the subsequent files will be named IO010001.MP4, IO020001.MP4 and IO030001.MP4. Multiple small/thin files are created as well. 4GB is the maximum file size for the FAT32 file system which is the defacto standard for transferring files between flash memory cards, most personal computers and portable devices. The FAT32 File System is based on 32 bit words. 4GB-1 is the largest number that can be expressed in 32 bits. At the time that FAT32 was invented a 4GB hard disk was rare and most files were measured in KB.