Alert cameras require NTFS file system format.
When a user puts a microSD card into a camera that is NOT formatted NTFS, firmware will automatically format the microSD card as NTFS. Any existing data will be overwritten.
User puts a microSD card into a camera that is NTFS, firmware uses the card. No files will be overwritten. Available space will be used for Alert video. Existing Alert video will be overwritten on the standard process of overwriting oldest file.