USB drive not being recognized under Linux
In order to access USB drive under Linux you need to load special USB driver and support must be included in running Linux kernel. Try following command one by one to solve your problem:
Step # 1 : Make sure your external drive detected by system
Run dmesg command which print or control the kernel ring buffer:
# dmesg
OR
# dmesg | grep –i USB
Output:
SLPB PCI0 HUB0 USB0 USB1 USB2 USBE usbcore: registered new driver usbfs usbcore: registered new driver hub USB Universal Host Controller Interface driver v2.3 uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 hub 1-0:1.0: USB hub found uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 hub 2-0:1.0: USB hub found uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 usb 1-2: new full speed USB device using uhci_hcd and address 2 hub 3-0:1.0: USB hub found
As you see USB support is included in kernel. You can also verify this with following command:
# lspci -v | grep HCI
Output:
0000:00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 02) (prog-if 00 [UHCI]) 0000:00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 02) (prog-if 00 [UHCI]) 0000:00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 02) (prog-if 00 [UHCI]) 0000:00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI])
Step # 2 : Load USB modules/driver
If you cannot see your external USB drive in above dmesg output then try to load usb-uhci and usb-ohci modules (driver):
# modprobe usb-uhci
# modprobe usb-ohci
# modprobe usb-storage
Now again run dmesg:
# dmesg
Output:
usb 4-1: new high speed USB device using ehci_hcd and address 3 scsi2 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 3 usb-storage: waiting for device to settle before scanning Vendor: SAMSUNG Model: SV4002H Rev: 0811 Type: Direct-Access ANSI SCSI revision: 00 SCSI device sdb: 78242976 512-byte hdwr sectors (40060 MB) sdb: assuming drive cache: write through SCSI device sdb: 78242976 512-byte hdwr sectors (40060 MB) sdb: assuming drive cache: write through sdb: sdb1 sd 2:0:0:0: Attached scsi disk sdb usb-storage: device scan complete
Step 3 : Use external USB drive
As you see device sdb assigned to an external USB drive use mount command to mount drive:
List partitions on /dev/sdb:
# fdisk -l | grep sdb
Output:
Disk /dev/sda doesn't contain a valid partition table Disk /dev/sdb: 40.0 GB, 40060403712 bytes /dev/sdb1 1 4870 39118243+ c W95 FAT32 (LBA)
Now mount partition:
# mount /dev/sdb1 /mnt
See also:
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