Differences between USB storage device name sd * and ub * in Linux

In Linux, USB storage devices are managed as local storage devices, just like local disks.

Therefore, after you enter the fdisk-l command, the USB storage device is listed with the local disk.
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The USB flash drive device is named sdb and is simulated as a SCSI device for storage management. After Linux 2.6.9 kernel, an independent management module is added for the USB storage device, which is the driver/block/ub. c file.
You need to compile device driver-> block driver-> low usb block into a module or in the kernel. In this way, the USB storage device is managed by the ub module and the device name is of the ub * type. Www.2cto.com