This is a question to end my wondering, more than a problem.
I am playing around with some USB memory sticks on Linux. When inserted they are automatically mounted, and I can access the files. Two new nodes appear in /dev/: /dev/sdb and /dev/sdb1. I know what this means: sdb is the second SCSI device and sdb1 is the first partition on this device.
For one single USB pen, it behaves differently. It is still mounted and I can access the files. The fs-node /dev/sdb appears, but there is no /dev/sdb1.
Why is that?
This USB memory stick is smaller than the others, 1GB versus 4GB, and is older.