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.

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SAMSUNG PRO Endurance 256GB Memory Card, White, MB-MJ256KA/AM

SAMSUNG PRO Endurance 256GB Memory Card, White, MB-MJ256KA/AM

Product ID: 438933189

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Details

Brand
SAMSUNG
Model name
PRO Endurance
Flash memory type
Micro SD
Memory storage capacity
256 GB
Compatible devices
Camera Drone

⏳140K hours recording endurance

⚡100/40 MB/s read/write speed

🛡️Rugged: water, X-ray, magnet & drop proof

Description

🛡️ Capture Every Moment, Endure Every Challenge

UNMATCHED ENDURANCE - Records up to 140,000 hours—over 16 years of nonstop reliability.
BLAZING FAST TRANSFERS - Seamlessly handle 4K and FHD files with up to 100MB/s read speed.
PEACE OF MIND WARRANTY - Backed by a 5-year limited warranty for long-term data security.
PERFECT FOR PRO MONITORING - Ideal for CCTV, dash cams, body cams, and Nintendo Switch compatibility.
BUILT FOR EXTREME CONDITIONS - Engineered to resist water, X-rays, magnets, drops, and wearout.

The SAMSUNGPRO Endurance 256GB microSDXC card delivers professional-grade durability and performance with up to 140,000 hours of recording, 100MB/s read speeds, and robust protection against water, X-rays, magnets, and drops—perfect for high-resolution 4K video capture in demanding environments like CCTV, dash cams, and gaming.

Specifications

Colour	White
Special features	Wearout Proof, X Ray Proof
Reading speed	40 Megabytes Per Second
Item weight	0.25 Grams
Warranty type	Limited
Writing speed	40 mb / s
Hardware interface	microSDXC
Secure digital association speed class	Class 10
Product dimensions	1L x 15W millimeters
Manufacturer	Samsung Electronics
UPC	887276591100
Item model number	MB-MJ256KA/AM
Color	White
Standing screen display size	7 Inches
RAM Size	256 GB
Are Batteries Included	No
Item Weight	0.25 g