Mount USB devices

lsusb
    Will tell you what USB devices Linux detects. -v will be more verbose.

lsblk
    To see which device is your USB device.

ls -l /dev/* | wc -l
    Compare the lists of devices in /dev before and after plugging in the USB device.

dmesg
    Look at what is happening in dmesg when you plug in the USB device.
    If the USB devices is not seen in the above, try;
        modprobe usb-uhci
        modprobe usb-ohci
        modprobe usb-storage

fdisk -l OR cfdisk /dev/***
    will tell you the filesystem type, in the form of an ID. You may have to look up the ID number.
fdisk /dev/***
    then m for HELP and then l will list FileTypes for ID above.

mount /dev/sda1 /home/user/whereEver
    If an entry is in fstab, then you need the above to mount a different device, different FileSystem etc.

    Example fstab entry;
/dev/sdb1 /mnt/hd ntfs defaults 0 0
The ntfs can be changed to auto and as such will mount different FileSystems

mount -a will attempt to mount all entries in fstab