Scanning floppy devices with assumed density

[John Klos <john%ziaspace.com@localhost>]

Hi, all,

It has been ages since I've used floppies in NetBSD very much, but 
checking the man page, different slice letters are used to indicate disk 
densities. From fdc(4):

     The driver supports the following floppy diskette formats by using
     particular partitions:
           1.44MB 3.5-inch (b)
           1.2MB 5.25-inch (c)
           360KB 5.25-inch (1.2MB drive) (d)
           360KB 5.25-inch (IBM-PC drive) (e)
           720KB 3.5-inch (f)
           720KB 5.25-inch (g)
           360KB 3.5-inch (h)

A user on Reddit pointed out this error on booting a NetBSD 9 kernel on an 
i80486 system:

boot device: fd0 [ 5.121888] fd0d: hard error reading fsbn 0 of 0-2 (st0 
0x40<abnrml> st1 0x1<no_am> st2 0x0 cyl 0 head 0 sec 1)

https://www.reddit.com/r/NetBSD/comments/vh4wgc/a_little_bit_of_fun_booting_the_netbsd_162/idyrf95/

She wondered why fd0d is being used here. I can't imagine this is due to 
scanning for a disklabel, since they've been around forever, so is this 
perhaps due to dkwedge_discover?

John