Here is the problem: My usb storage device has a 64kB (limited by hardware) buffer used to cache reads/writes which means it can only cache up to 128 blocks(512B) of memory. The SCSI Write-10 command has a total-blocks field that can be up to 256 blocks (128kB). When originally testing the product on Windows 11 it never writes more than 128 blocks at a time but when tested on Linux it sometimes writes more than 128 blocks, which causes the microcontroller to crash.

Is there a way to tell the host OS not to request more than 128 blocks?

I have implemented block limit VPD page, and it works well on Windows 10/11. I even set the block limit to be 64 blocks, it’s OK! However, on Linux or MacOS, the host does not appear to be running the block limits command.