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.


It means the usb stick has no partition table, it simply has one filesystem which spans the entire stick.

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