Comment # 5 on bug 927677 from Bj�rn Lie

Disk in question has:

    HintSystem:                 true
    Id:                         by-id-scsi-0__058F

Since the kernel names the disk scsi-0__0XXX 
udisks sees this as a system disk, hence need root 

Reassigning to kernel-team

Relevant codebits
from src/udiskslinuxblock.c (in udisks)


  /* Provide easy access to _only_ the following devices
   *
   *  - anything connected via known local buses (e.g. USB or Firewire, MMC or
MemoryStick)
   *  - any device with removable media
   *
   * Be careful when extending this list as we don't want to automount
   * the world when (inadvertently) connecting to a SAN.
   */
  if (drive != NULL)
    {
      const gchar *connection_bus;
      gboolean removable;
      connection_bus = udisks_drive_get_connection_bus (drive);
      removable = udisks_drive_get_media_removable (drive);
      if (removable ||
          (g_strcmp0 (connection_bus, "usb") == 0 || g_strcmp0 (connection_bus,
"ieee1394") == 0) ||
          (g_str_has_prefix (device_file, "/dev/mmcblk") || g_str_has_prefix
(device_file, "/dev/mspblk")))
        {
          hint_system = FALSE;
          hint_auto = TRUE;
        }
    }