i have try 2 years ago booting from a SD works for a few hours the wear is to much
now i read they have new way of reducing the wear by write 1 bit a cell the wear get reduced a lot

but is the wear enough to use to boot a OS on it?.

PS.
i don't understand why consumers are not pushing the market forward of SD technology what crap have you on a SSD if it's put in your machine or NVMe when it's branded on your mainboard.

SLC SSDs were the first SSD type on the market over a decade ago. Very expensive, very fast (at the time), but also very low capacity. I don't think anyone makes SLC any more, the best you can hope for is MLC (2bit cells), Samsung still makes them but they are expensive. The majority SSDs are TLC (3) and now QLC (4) - more capacity + cheaper. Some SSDs controllers allow to use free space as SLC for speed but as the drive fills up, it reverts to full capacity.

i think we talking about 2 different subjects you talking about Solid state drives (SSD) i talking about those tiny flash cards (SD)

and yea it matters a ton if they are 2 bit or single bit cells do to wearing levels. especially with NAND technology.
just wanna know if someone here try to use it for a OS and if the wearing levels really not effect the OS

I'm running a Pi from a MicroSD card. I've taken an image of it though - I've had one fail previously and don't fancy spending ages reconfiguring the OS again.

yeah, well, your OP is not entirely clear TBH. You should work on that if you want appropriate answers.

If you just need any old OS, your best bet would be some Linux live distro.
They'll generally keep any changes to the file system in RAM until shutdown, when it'll all be written at once.

That way, there will only be minimal wear on the SD card.

I've never tried any of the guides to running Windows from a USB stick, but with the way Windows 10 hammers my SSD, I can't imagine it would be an enjoyable experience.

I'm pretty sure Microsoft removed the ability to (officially) be able to do that. I'm guessing it would be horrific and the whole thing would fall over in a matter of weeks/months.

In general, apart from low cost computing systems (like the Pi), I can't understand why it would be desirable to boot from an SD card; the speed is going to be worse than you get from an SSD, they cost more at SSD size capacities and they don't have the same warranties and technology that decent SSDs have to maintain their lifespan.

I can give you a few very good reasons why it's absolute great idea.

1.
Low entropy on your OS just create clean ready to go OS, ghost few SD cards and you forever set

2.
Virus's no big deal, System crash no big deal, Restore time 1 second you ready to go (smash a other SD in it)

3.
did i say how easy to switch from OS to OS it is without a stupid boot loader?

4.
Restore point you choose you only need to ghost the original SD to a other SD you sudden strike me with gold man.
i need to make a Linux distro like a CD player and use virtual memory Drive for the writing crap (no wear on SD)
if i recall you can put a switch down on the SD card to prevent writing
it's likely i can do the same crap for Windows with special tools and some ground work

Clarry mentioned previously that this isn't exactly what happens. The switch just sends a signal asking to not be written and is up to OS(driver) to accept it or not. I've booted Batocera from a SD card on a old laptop. While you can use Retroarch instaled on the OS itself, Batocera has a much simpler and intuitive UI, just boot and play with little to no setup required (and the setup can be done with a gamepad).

edit: found the said post

I must admit I've never thought of loading from the SD card, but I did it often from a USB for maintanance purposes on family and friends PCs. Now I do it from an SSD through a USB adapter, but the principle is the same.

I guess doing it every so often should work, but yes, the reliability of the SD cards when you have a lot of traffic... well they just weren't designed for that.

I can see that you want to do this - what I'm interested in is what specific set of circumstances or activity that you're doing makes this a better option than just buying a cheap SSD? Even if you're worried about the failure rate of SSDs, unless you're writing loads (and I mean LOADS) to the SSD every day, it's unlikely to fail unreasonably quickly.

I think there are applications where it is of interest such as with a Raspberry Pi or possibly some sort of a situation where security and malware is a concern

the more durable usb, sd cards, and ssd are typically marketed as enterprise, datacenter, or surveillance-camera grade sd cards, sometimes called endurance.

commercial-slc grade is typically 0-50 degrees, industrial grade-slc for embedded applications have wide temperature design (possibly just related to thermal sensor calibration) for -50-100 degrees centigrade.

I have seen there are sata-doms and usb-doms that have a hardware write protection switch. It is up to the consumer to determine the functionality of such a feature.

Guess i buy 2 External SSD's
while it's not as cool like booting from SD they do not wear down that easy.

https://www.alternate.nl/ADATA/SD700-256-GB-externe-SSD/html/product/1334762?

What's cool about booting from a media format that's old enough to have shared the same space with PDAs?