Testing CAM wrapper for ata(4) controller drivers

i'm not sure if this issue is directly linked to ATA_CAM, but i've not seen it
before the ATA_CAM changes:

removing a cd/dvd and inserting a new one doesn't update the label in
/dev/iso9660.

`file -s /dev/iso9660/CD1` says:
/dev/iso9660/CD1: ISO 9660 CD-ROM filesystem data 'CD2
'

cheers.
alex