Flash Devices For In-Camera Recording

Paul, you are referring to edge recording / using SD cards, yes? And are you asking about which cameras work the best or which flash / SD cards are the best?

There are basically two types of flash memory (although it is more complicated than this in reality) : Single-Level Cell (SLC) and Multi-Level Cell (MLC) devices. MLC devices can store more bits per cell and so are cheaper to manufacture for a specific memory capacity. They are less robust than SLC devices and have a much smaller number of write cycles before they start to fail. SLC cards have a much higher number of write cycles and are often advertised as "industrial-level" cards. But beware - some MLC cards are also advertised as industrial level, simply having a wider operating temperature range and other characteristics that involve more technical detail than I care to go into here. (Which is another way of saying "beyond my level of competence" !)

Discovered that recordign in Continuous mode is recomended, becauuse motion detection causes tte camera to create a file every time a MD video clip is generated, thus filling the SD cards in few hours.

Some brands (like Flir's Digimerge) offers 2 Format modes: SD Video and EXT3. In small capacity SD cards (2 GB) both can be used but in a 64GB SD card I could only format in SD Video format, causing that a D1@5 fps videoclip using more than 700 MB/hour.

Still testing, but be careful when proposing long storage (days) on SD cards!