I've tested on a few different machines I have at my disposal and in all cases, NetBSD/{amd64,i386} (-10 or current) booted from a SanDisk Cruzer Glide (16GB) and mounting a filesystem read/write will report an HBA error and write errors on shutdown.
I've now moved my NetBSD-10 live-USB installations to USB flash drives by PNY and they have no issues upon system shutdown. The SanDisk devices do work, I just can't use one as a bootable device with NetBSD. -- |/"\ John D. Baker, KN5UKS NetBSD Darwin/MacOS X |\ / jdbaker[snail]consolidated[flyspeck]net OpenBSD FreeBSD | X No HTML/proprietary data in email. BSD just sits there and works! |/ \ GPGkeyID: D703 4A7E 479F 63F8 D3F4 BD99 9572 8F23 E4AD 1645