4.2GB file limit why? The video gets cut at 4.2GB and it's not a clean cut. Is there a workaround?

Also, is there a way to get email notifications on this forum?

The file size is limited by the FAT32 file system:
https://support.wdc.com/knowledgebase/answer.aspx?ID=1287

The maximum size of one file is 232 = 4 GB in FAT32. So the size of a single file cannot be larger than 4 GB. Otherwise, the file may get lost or abnormal and cannot be read.
Besides, the size of the single file can be larger in Exfat. But abnormal power-off or SD card removal may damage the file. If the file cannot be recovered, customers may suffer great loss. So the maximum size is 4 GB in the camera regardless whether the format is FAT32 or ExFAT.

DJI Thor Posted at 2017-8-13 02:30
The maximum size of one file is 232 = 4 GB in FAT32. So the size of a single file cannot be larger than 4 GB. Otherwise, the file may get lost or abnormal and cannot be read.
Besides, the size of the single file can be larger in Exfat. But abnormal power-off or SD card removal may damage the file. If the file cannot be recovered, customers may suffer great loss. So the maximum size is 4 GB in A9 camera regardless whether the format is FAT32 or ExFAT.

Huh, are you stating that FAT32 is inherently safer than Exfat, or that it's safer to periodically close the file and open a new one at the 4GB boundary??

@Ex Machina - no shot is safe until the file has been closed out, on either ExFAT or FAT32. At the 4GB boundary the file will close itself out, safely. The only real risk there is the possible loss of a few frames in the middle of a shot as the new file begins to record.

Qoncussion Posted at 2017-8-13 07:43
@Ex Machina - no shot is safe until the file has been closed out, on either ExFAT or FAT32. At the 4GB boundary the file will close itself out, safely. The only real risk there is the possible loss of a few frames in the middle of a shot as the new file begins to record.

I assume he's saying sticking with FAT32 was a conscious decision by DJI to lessen the chance of unclosed files.

Ex Machina Posted at 2017-8-13 06:32
Huh, are you stating that FAT32 is inherently safer than Exfat, or that it's safer to periodically close the file and open a new one at the 4GB boundary??

It would be safer to open a new file. But the need to break the boundary had submitted to our engineers, it will be changed if possible in the future.

How do I get notified for new message on this fourm?