USB デバイスを認識しているところの /var/log/messages
umass0: Iomega USB Zip 100, rev 1.10/1.00, addr 6
umass0: Get Max Lun not supported (STALLED)
da1 at umass-sim0 bus 0 target 0 lun 0
da1: <IOMEGA ZIP 100 10.V> Removable Direct Access SCSI-0 device 
da1: 650KB/s transfers
da1: Attempt to query device size failed: NOT READY, Logical unit is in process of b

usbdevs -v の結果
 port 1 addr 6: self powered, config 1, USB Zip 100(0x0031), Iomega(0x059b), rev 1.00