Leave a data CD in the USB drive at startup, Linux is trying to find a data CD. Alternatively, ignore error,it is trying to map contents of drive and tha mapping script does not like being told no data. Small bug related partly to the way Linux does USB CD-ROMs. Similar issues with ZIP drives. Linux sometimes will not use drives that show no contents at startup, but more often what happens is you get a lag before data access with USB CD-ROMs. Built-ins have no such problem.

Essentially that particular error is "I can't find any data on this thing," and might not affect the drives operation once things are up and running. IF you have problems getting data read later, let us know about those, this is a situation where actual errors in use will help figure out what to fix better than startup errors.

The pause at startup, unless it is a lock, is that Linux tries many times to find data on something that it thinks normally has data on it before giving up and it tries to make a list for itself of what is on drive. right now some models of machine and USB device work better if the CD-ROM is not plugged in until after boot is complete, otehrs work best with a data CD in drive at boot, and still othrs only work when device is hooked up at boot and it has a CD with data (not a music CD) on it in it at boot time. Is partly how mfrs vary how their CDR drives work.

John Danielson.