Udevadm info -a -n /dev/sdX

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udevadm info -a -n /dev/sdd

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host4/target4:0:0/4:0:0:0/block/sdd':
    KERNEL=="sdd"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{ro}=="0"
    ATTR{events_poll_msecs}=="-1"
    ATTR{hidden}=="0"
    ATTR{range}=="16"
    ATTR{events_async}==""
    ATTR{inflight}=="       0        0"
    ATTR{capability}=="50"
    ATTR{ext_range}=="256"
    ATTR{stat}=="     220        0    16832     1735        1        0        8        0        0      252     1596        0        0        0        0"
    ATTR{discard_alignment}=="0"
    ATTR{removable}=="0"
    ATTR{alignment_offset}=="0"
    ATTR{size}=="19532873728"
    ATTR{events}==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host4/target4:0:0/4:0:0:0':
    KERNELS=="4:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{iodone_cnt}=="0x14b"
    ATTRS{evt_inquiry_change_reported}=="0"
    ATTRS{evt_media_change}=="0"
    ATTRS{queue_type}=="none"
    ATTRS{inquiry}==""
    ATTRS{evt_mode_parameter_change_reported}=="0"
    ATTRS{scsi_level}=="7"
    ATTRS{blacklist}=="FORCELUN"
    ATTRS{rev}=="4009"
    ATTRS{evt_capacity_change_reported}=="0"
    ATTRS{evt_lun_change_reported}=="0"
    ATTRS{model}=="My Book 25EE    "
    ATTRS{vendor}=="WD      "
    ATTRS{iocounterbits}=="32"
    ATTRS{iorequest_cnt}=="0x14b"
    ATTRS{queue_depth}=="1"
    ATTRS{max_sectors}=="2048"
    ATTRS{eh_timeout}=="10"
    ATTRS{timeout}=="30"
    ATTRS{type}=="0"
    ATTRS{device_blocked}=="0"
    ATTRS{device_busy}=="0"
    ATTRS{state}=="running"
    ATTRS{ioerr_cnt}=="0x3c"
    ATTRS{evt_soft_threshold_reached}=="0"
    ATTRS{dh_state}=="detached"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host4/target4:0:0':
    KERNELS=="target4:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host4':
    KERNELS=="host4"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0':
    KERNELS=="3-2:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb-storage"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bInterfaceClass}=="08"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceSubClass}=="06"
    ATTRS{authorized}=="1"
    ATTRS{bInterfaceProtocol}=="50"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2':
    KERNELS=="3-2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{maxchild}=="0"
    ATTRS{removable}=="removable"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{configuration}==""
    ATTRS{rx_lanes}=="1"
    ATTRS{tx_lanes}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{serial}=="344447544D4E355A"
    ATTRS{busnum}=="3"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bcdDevice}=="4009"
    ATTRS{idProduct}=="25ee"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{ltm_capable}=="no"
    ATTRS{version}==" 3.10"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{devpath}=="2"
    ATTRS{idVendor}=="1058"
    ATTRS{speed}=="5000"
    ATTRS{product}=="My Book 25EE"
    ATTRS{bMaxPacketSize0}=="9"
    ATTRS{bmAttributes}=="c0"
    ATTRS{authorized}=="1"
    ATTRS{bMaxPower}=="8mA"
    ATTRS{urbnum}=="1283"
    ATTRS{quirks}=="0x0"
    ATTRS{manufacturer}=="Western Digital"
    ATTRS{devnum}=="4"
    ATTRS{bDeviceClass}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3':
    KERNELS=="usb3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{quirks}=="0x0"
    ATTRS{bMaxPacketSize0}=="9"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bDeviceClass}=="09"
    ATTRS{ltm_capable}=="yes"
    ATTRS{idProduct}=="0003"
    ATTRS{urbnum}=="119"
    ATTRS{version}==" 3.00"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{speed}=="5000"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{busnum}=="3"
    ATTRS{authorized_default}=="1"
    ATTRS{idVendor}=="1d6b"
    ATTRS{authorized}=="1"
    ATTRS{removable}=="unknown"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{product}=="xHCI Host Controller"
    ATTRS{serial}=="0000:00:14.0"
    ATTRS{devpath}=="0"
    ATTRS{bDeviceProtocol}=="03"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bcdDevice}=="0504"
    ATTRS{rx_lanes}=="1"
    ATTRS{maxchild}=="10"
    ATTRS{manufacturer}=="Linux 5.4.0-42-generic xhci-hcd"
    ATTRS{tx_lanes}=="1"

  looking at parent device '/devices/pci0000:00/0000:00:14.0':
    KERNELS=="0000:00:14.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x00eb"
    ATTRS{device}=="0xa1af"
    ATTRS{subsystem_vendor}=="0x1590"
    ATTRS{class}=="0x0c0330"
    ATTRS{irq}=="42"
    ATTRS{numa_node}=="0"
    ATTRS{local_cpus}=="000f,ff000fff"
    ATTRS{driver_override}=="(null)"
    ATTRS{ari_enabled}=="0"
    ATTRS{local_cpulist}=="0-11,24-35"
    ATTRS{dbc}=="disabled"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{enable}=="1"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}=="1"
    ATTRS{revision}=="0x09"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

See also[edit]

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