http://jjz5ajknu5rku4p6xb6i5xwjnp3nd6c3jwi2qnzbpaodyf7g2lja.b32.i2p/docs/misc/index.html
NetBSD always applies a BSD disklabel to connected drives,
whether real or fictitious. For example, /dev/wd0a refers to the first NetBSD partition, and /dev/rwd0d refers to the entire raw disk. "e" is also special, it will be used
for FAT32 partitions, e.g. on a USB drive without a real disklabel installed,
the partition containing the data is likely /dev/sd0e .