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手元の FreeBSD 11.1-RELEASE FreeBSD 11.1-RELEASE #0 だと

ugen6.2: <TEAC DV-W28U-V> at usbus6
umass0 on uhub2
umass0: <TEAC DV-W28U-V, class 0/0, rev 2.00/3.03, addr 2> on usbus6
umass0:  8070i (ATAPI) over Bulk-Only; quirks = 0x0100
umass0:11:0: Attached to scbus11
cd1 at umass-sim0 bus 0 scbus11 target 0 lun 0
cd1: <TEAC DV-W28U-V E.0A> Removable CD-ROM SCSI device
cd1: 40.000MB/s transfers
cd1: Attempt to query device size failed: NOT READY, Medium not present - tray c
cd1: quirks=0x10<10_BYTE_ONLY>

で /dev/cd1 を使って vlc で DVD も CD も再生できますから、
STABLE #11 までのどこかでおかしくなった可能性が高いですね。

平林 浩一