SD FTL are optimised for unexpected power loss instead of performance or low write amplification, so they write to the flash as soon as possible. They also have

SD FTL are optimised for unexpected power loss instead of performance or low write amplification, so they write to the flash as soon as possible. They also have almost no cache. USB drives are similar. SSDs either have a cache or rely on the host's cache, and that means they are at much higher risk of corruption from unexpected power loss, but can absorb a lot of writes that don't actually reach the flash but are just updating the cache.