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By doing udevadm info -a /dev/sda

we can see something like:

  looking at parent device '/devices/pci0000:3d/0000:3d:02.0/0000:60:00.0/host6/port-6:0/end_device-6:0/target6:0:0/6:0:0:0':
    KERNELS=="6:0:0:0"
    SUBSYSTEMS=="scsi"

However, this device is a SATA SSD, why it's subsystem is scsi?

This line:

KERNELS=="6:0:0:0" means SCSI address, correct?

In my understanding, they are different interfaces( SATA & SCSI ).

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The interface may be SATA or SAS or SCSI (or at least in part, ATA/IDE), but the protocol spoken on the interface is either scsi or a substantially similar superset (or in the case of IDE, subset) of SCSI or can be easily emulated by the SCSI protocol layer in the kernel.

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