On a technical level, what exactly makes these have a longer lifespan than the standard samsung micro sd cards?

It is MLC. I attached link. https://news.samsung.com/global/video-5-years-vs-3-months-samsungs-new-pro-endurance-memory-cards

Does it support Blackvue DR900s 2ch?

I've had this in my Blackvue DR900S-2CH for nearly 2 years without any issues. I previously had a Sandisk High Endurance card and it would randomly reboot every few weeks. This Samsung card has been rock-solid

Does 32gb work well for tesla sentry?

Yes, I have both the 128 and 32 as a backup for my Tesla, both work great. If you go above 32 you have to use another program to format to fat 32, but it’s not difficult.

Is the 32gb pre-formatted to fat32?

Just as an FYI, if you have a card reader for your PC, there are free programs that'll allow you to reformat any SD/HDD/SSD to FAT32--even the largest ones. (one utility is "fat32format") The inability to format cards >32GB as FAT32 from within the built-in Window's utilities is an arbitrary limitation they've set, essentially removing our choice in the matter for whatever reasons. The actual maximum partition size for FAT32 is 2TB. I've found this often also gets around many devices' supposed maximum supported card size--the max size they claim is based on the version of ExFAT/licensing that's legal for the device, and if they didn't license ExFAT support in the firmware, they usually only claim a 32GB max, however I've run FAT32 formatted cards of 64/128GB in more devices than I can remember that said they couldn't do it... but they did when it was the correct format.

ASIN	B09WB3D5GQ
Amazon Bestseller	#97,362 in Computers ( See Top 100 in Computers ) #928 in Micro SD Memory Cards
Are Batteries Included	No
Color	white
Customer Reviews	4.7 4.7 out of 5 stars (3,830)
Date First Available	May 8, 2022
Hard Drive Interface	Solid State
Hardware Interface	microSDXC
Is Discontinued By Manufacturer	No
Item Weight	0.25 g
Item dimensions W x H	1 x 15 x 11 mm
Item model number	MB-MJ256KA/AM
Manufacturer	Samsung
Product Dimensions	1L x 15W mm
RAM Size	256 GB
Read Speed	40 Megabytes Per Second
Secure Digital Association Speed Class	Class 10
Special Feature	Portable
Standing screen display size	7 Inches
UPC	887276591100
Warranty Type	Limited
Write Speed	40 mb/s

Samsung PRO Endurance 256GB MicroSDXC Memory Card with Adapter for Dash Cam Bodycam Security Camera Class 10 U3 V30 (MB-MJ256KA/AM)

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