Currently Being ModeratedFeb 7, 2013 5:17 PM (in response to Tobiathy)
Most flash drives have a slider that lets you change its locked state while it is not connected to anything. The other thing to check, especially for any of 8 GB or more, is if it was formatted ExFat at the factory. If it was, you'll need to upgrade to 10.6.4 or later or reformat it for the Mac alone to be able to use it. ExFat is only supported on 10.6.4 or later.
Currently Being ModeratedFeb 7, 2013 5:22 PM (in response to a brody)
Alternatively, you can format it for NTFS, but that means to be able to write to it, you'll need an NTFS tool, such as is described on this tip: