On Wed, Jun 12, 2019 at 10:43:11AM -0400, Alan Stern wrote:
> Would it be okay to rely on the assumption that USB block devices never 
> have block size < 512?  (We could even add code to the driver to 
> enforce this, although refusing to handle such devices at all might be 
> worse than getting an occasional error.)

sd.c only supports a few specific sector size, and none of them is
< 512 bytes:

        if (sector_size != 512 &&
            sector_size != 1024 &&
            sector_size != 2048 &&
            sector_size != 4096) {
                ...
                sdkp->capacity = 0;
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