Other smartctl -d

I'm trying to run smartctl -a /dev/da0 where da0 is a USB M.2 drive, and I need to specify a '-d' option for my
'unknown USB bridge' [0x048d:0x1234 (0x200)].

How do I know what to use?

I presume 048d:1234 is a vendor/product id.
 
The smartctl man page has good documentation; if necessary, just try all the USB related ones, there are only a handful.

In general, read the man pages and the handbook.
 
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