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I recently formatted my new Sandisk USB Stick with linux from the default FAT32 to ext4. Unfortunatelly, when Thunar Automounts the stick, it is mounted as root and not as the current user, so if I want to write to it, I need to open a root shell (or sudo).

When I reformat the stick to ntfs, everything works fine...does anybody know, why this happens and how I can change that behaviour?

(I also tried it with Nautilius -> same outcome)

user@xubuntu:~$ ls -al /media/user/
total 12
drwxr-x---+ 3 root root 4096 Aug 13 17:03 .
drwxr-xr-x  3 root root 4096 Aug  6 10:11 ..
drwxr-xr-x  3 root root 4096 Aug 13 16:25 usbtest

Please let me know, if you need any further information than provided...

UPDATE

This is the output of lsusb, that a friend suggestend:

Bus 001 Device 002: ID 0781:5575 SanDisk Corp. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0781 SanDisk Corp.
  idProduct          0x5575 
  bcdDevice            1.27
  iManufacturer           1 (error)
  iProduct                2 (error)
  iSerial                 3 (error)
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              200mA
    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               0
      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               1
Device Status:     0x0000
  (Bus Powered)
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