umass0: vendor 0x0ef8 QA-WATCH-MP3, rev 1.10/1.00, addr 2
da2 at umass-sim0 bus 0 target 0 lun 0
da2: <INQUIRY QA-WATCH-MP3 0-01> Removable Direct Access SCSI-0 device 
da2: 1.000MB/s transfers
da2: 251MB (515072 512 byte sectors: 64H 32S/T 251C)
(da2:umass-sim0:0:0:0): Synchronize cache failed, status == 0x4, scsi status == 0x0

Then when I try to mount it, I get:

Opened disk da2 -> 5