Why PenDrive is not mounted?

n00b_noob · 11-29-2020, 07:28 AM

Hello,
I have a PenDrive with below information:

Code:

$ sudo lsusb -D /dev/bus/usb/002/023 
Device: ID 0c76:0005 JMTek, LLC. Transcend Flash disk
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0c76 JMTek, LLC.
  idProduct          0x0005 Transcend Flash disk
  bcdDevice            1.00
  iManufacturer           1 GENERIC 
  iProduct                2 USB Mass Storage
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0020
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

But, drive not mounted:

Code:

$ sudo lsblk 
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk 
├─sda1   8:1    0   667M  0 part 
├─sda2   8:2    0  84.2G  0 part /
├─sda3   8:3    0 372.5G  0 part /home
└─sda4   8:4    0   8.4G  0 part [SWAP]
sr0     11:0    1  1024M  0 rom

Why?

Thank you.

berndbausch · 11-29-2020, 08:15 AM

Please use correct terminology to avoid confusions. In the context of storage and Linux/UNIX, the term "mount" has a very specific meaning, namely connecting a filesystem to a directory (the "mount point"). It does not mean "recognizing that a storage device has been attached".

In your case, the USB device is recognized but not as a block device. The first thing I would do is checking kernel messages to find out what happens when the thumb drive is inserted. Tools to see kernel messages are the dmesg command, or journalctl -k if your system uses systemd, or system log files /var/log/syslog or /var/log/messages depending on the distro.

wpeckham · 11-29-2020, 08:18 AM

Quote:

Originally Posted by n00b_noob

Hello,
I have a PenDrive with below information:

Code:

$ sudo lsusb -D /dev/bus/usb/002/023 
Device: ID 0c76:0005 JMTek, LLC. Transcend Flash disk
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0c76 JMTek, LLC.
  idProduct          0x0005 Transcend Flash disk
  bcdDevice            1.00
  iManufacturer           1 GENERIC 
  iProduct                2 USB Mass Storage
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0020
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

But, drive not mounted:

Code:

$ sudo lsblk 
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk 
├─sda1   8:1    0   667M  0 part 
├─sda2   8:2    0  84.2G  0 part /
├─sda3   8:3    0 372.5G  0 part /home
└─sda4   8:4    0   8.4G  0 part [SWAP]
sr0     11:0    1  1024M  0 rom

Why?

Thank you.

Have you tried running a mount command to mount the device?
What is your distribution and version?

berndbausch · 11-29-2020, 08:33 AM

Quote:

Originally Posted by wpeckham

Have you tried running a mount command to mount the device?

To use mount, a device file is required. Which OP doesn't seem to have.

pan64 · 11-29-2020, 08:42 AM

is this still the same issue? https://www.linuxquestions.org/quest...le-4175685050/

n00b_noob · 12-02-2020, 03:23 AM

Quote:

Originally Posted by pan64

is this still the same issue? https://www.linuxquestions.org/quest...le-4175685050/

No, it is another USB.

n00b_noob · 12-02-2020, 03:25 AM

Quote:

Originally Posted by berndbausch

Please use correct terminology to avoid confusions. In the context of storage and Linux/UNIX, the term "mount" has a very specific meaning, namely connecting a filesystem to a directory (the "mount point"). It does not mean "recognizing that a storage device has been attached".

In your case, the USB device is recognized but not as a block device. The first thing I would do is checking kernel messages to find out what happens when the thumb drive is inserted. Tools to see kernel messages are the dmesg command, or journalctl -k if your system uses systemd, or system log files /var/log/syslog or /var/log/messages depending on the distro.

Thank you.

Code:

[14421.916953] usb 2-8: new high-speed USB device number 5 using xhci_hcd
[14422.066069] usb 2-8: New USB device found, idVendor=0c76, idProduct=0005, bcdDevice= 1.00
[14423.070276] sd 6:0:0:0: Attached scsi generic sg3 type 0
[14423.071212] sd 6:0:0:0: [sdc] Attached SCSI removable disk

I can't format it:

Code:

$ sudo mkfs.ext4 /dev/sdc 
mke2fs 1.44.5 (15-Dec-2018)
Could not open /dev/sdc: No medium found

berndbausch · 12-02-2020, 04:59 AM

The scsi disk driver attaches a removable drive. When trying to format it, it turns out there is no medium in the drive. As if this were a CDROM drive with no CD in it, or perhaps an SD card reader without a card.

Somehow, the USB flash disk is seen as an empty drive. I can't tell why, but perhaps you find something on the internet. A simple explanation: the device is faulty.

Another possibility: The wrong driver is used. Perhaps several drivers have the same vendor/model combination in their metadata. I don't know whether it is possible to blacklist sg3 when booting?

Or to exclude hardware failure, try the device on another system, if possible something else than Linux.

sevendogsbsd · 12-02-2020, 10:13 AM

Are there partitions on the device?

ondoho · 12-03-2020, 12:40 AM

Quote:

Originally Posted by n00b_noob

Quote:

Originally Posted by pan64

is this still the same issue? https://www.linuxquestions.org/quest...le-4175685050/

No, it is another USB.

In that thread:

Quote:

Originally Posted by n00b_noob

Code:

[18167.939101] usb 2-8: New USB device found, idVendor=0c76, idProduct=0005, bcdDevice= 1.00

In this thread:

Quote:

Originally Posted by n00b_noob

Code:

$ sudo lsusb -D /dev/bus/usb/002/023 
Device: ID 0c76:0005 JMTek, LLC. Transcend Flash disk

Colour me sceptical.

More than sceptical, given your posting history.

wpeckham · 12-03-2020, 04:31 AM

Quote:

Originally Posted by n00b_noob

Thank you.

Code:

[14421.916953] usb 2-8: new high-speed USB device number 5 using xhci_hcd
[14422.066069] usb 2-8: New USB device found, idVendor=0c76, idProduct=0005, bcdDevice= 1.00
[14423.070276] sd 6:0:0:0: Attached scsi generic sg3 type 0
[14423.071212] sd 6:0:0:0: [sdc] Attached SCSI removable disk

I can't format it:

Code:

$ sudo mkfs.ext4 /dev/sdc 
mke2fs 1.44.5 (15-Dec-2018)
Could not open /dev/sdc: No medium found

Question for you, where did you obtain this device? We have seen various configuration of FAKE usb devices (some actually destructive, some just not with far less space than advertised or none at all) on EBAY and WISH. Could you have a fake or faulty device?

pan64 · 12-03-2020, 04:37 AM

that is completely entangled https://www.linuxquestions.org/quest...ce-4175685248/