Tôi cắm một ổ cứng gắn ngoài vào máy tính xách tay của tôi. Tôi cố gắng tìm hiểu thông tin bằng cách
$ udevadm info -a -n /dev/sdb
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/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0/block/sdb':
KERNEL=="sdb"
SUBSYSTEM=="block"
DRIVER==""
ATTR{range}=="16"
ATTR{ext_range}=="256"
ATTR{removable}=="0"
ATTR{ro}=="0"
ATTR{size}=="312581808"
ATTR{alignment_offset}=="0"
ATTR{discard_alignment}=="0"
ATTR{capability}=="50"
ATTR{stat}==" 322 11207 13259 2196 2 0 16 0 0 1524 2196"
ATTR{inflight}==" 0 0"
ATTR{events}==""
ATTR{events_async}==""
ATTR{events_poll_msecs}=="-1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0':
KERNELS=="10:0:0:0"
SUBSYSTEMS=="scsi"
DRIVERS=="sd"
ATTRS{device_blocked}=="0"
ATTRS{type}=="0"
ATTRS{scsi_level}=="0"
ATTRS{vendor}=="USB 2.0 "
ATTRS{model}=="Storage Device "
ATTRS{rev}=="0100"
ATTRS{state}=="running"
ATTRS{timeout}=="30"
ATTRS{iocounterbits}=="32"
ATTRS{iorequest_cnt}=="0x165"
ATTRS{iodone_cnt}=="0x165"
ATTRS{ioerr_cnt}=="0x2"
ATTRS{evt_media_change}=="0"
ATTRS{dh_state}=="detached"
ATTRS{queue_depth}=="1"
ATTRS{queue_type}=="none"
ATTRS{max_sectors}=="240"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0':
KERNELS=="target10:0:0"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10':
KERNELS=="host10"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0':
KERNELS=="2-1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="usb-storage"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="02"
ATTRS{bInterfaceClass}=="08"
ATTRS{bInterfaceSubClass}=="06"
ATTRS{bInterfaceProtocol}=="50"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1':
KERNELS=="2-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="c0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="1076"
ATTRS{idVendor}=="0402"
ATTRS{idProduct}=="5621"
ATTRS{bcdDevice}=="0103"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="8"
ATTRS{devpath}=="1"
ATTRS{product}=="USB 2.0 Storage Device"
ATTRS{serial}=="00042222200000064007"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2':
KERNELS=="usb2"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="382"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0002"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 2.00"
ATTRS{maxchild}=="6"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.0-27-generic-pae ehci_hcd"
ATTRS{product}=="EHCI Host Controller"
ATTRS{serial}=="0000:00:1d.7"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7':
KERNELS=="0000:00:1d.7"
SUBSYSTEMS=="pci"
DRIVERS=="ehci_hcd"
ATTRS{vendor}=="0x8086"
ATTRS{device}=="0x293a"
ATTRS{subsystem_vendor}=="0x17aa"
ATTRS{subsystem_device}=="0x20f1"
ATTRS{class}=="0x0c0320"
ATTRS{irq}=="19"
ATTRS{local_cpus}=="ff"
ATTRS{local_cpulist}=="0-7"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
ATTRS{companion}==""
ATTRS{uframe_periodic_max}=="100"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
Tôi tự hỏi "chuỗi thiết bị mẹ" là gì, ngụ ý đầu ra? Tôi không hiểu ý looking at (parent) device
nghĩa của từng phương tiện. Ví dụ,
Đây có phải là ổ cứng gắn ngoài đầu tiên của tôi không? Phần còn lại là gì?
Tại sao tất cả ngoại trừ hai người cuối cùng có "usb" trong '...'?
Là cái bên cạnh khe cắm PCI cuối cùng?
Cái cuối cùng trống rỗng là gì, mặc dù có pci
tên của nó?
"Đi lên" có nghĩa là từ ổ cứng gắn ngoài đến CPU?
Cảm ơn!