20 min into record I get a double beep - what does that mean?

[jokiin]

FAT32 is what's used, the 4GB file size limitation is inherent to the format

 

[Rhody401]

That's a mathematical limit for that particular file allocation table format.

 

[SawMaster]

Taken from Wikipedia:

"The maximum possible size for a file on a FAT32 volume is 4 GiB minus 1 byte or 4,294,967,295 (232 − 1) bytes. This limit is a consequence of the file length entry in the directory table and would also affect huge FAT16 partitions with a sufficient sector size.[1] Large video files, DVD images and databases often exceed this limit."

The whole article is here: https://en.wikipedia.org/wiki/File_Allocation_Table#FAT32
The FAT32 section is about halfway down the page

Many standards are not set by any one person, but are inherent limitations or are agreed to by a large portion of the community who work with such things. Getting around such limitations may be impossible or nearly so unless you are deeply involved with their making, thus it is best for most folks to just work within those standards as best we can.

Phil

 

[Gibson99]

and yes there are other file systems out there, such as xfs, hfs and other journaling systems which can easily contain single files above 4gb in size. the problem is, they're much more CPU and RAM intensive, so low-power CPUs as used in dashcams can't handle it. they would have to use a more expensive, larger, more power-hungry cpu. not worth it since the need for files over 4gb is still not really necessary. maybe once we start seeing real 4k cameras with high bitrates and so on.

 

[jokiin]

journaling file systems aren't suitable for use with flash memory either without some specific wear levelling strategies in place, something else the cameras don't support