This was a brand new Sunworld USB 2.0 and 3.0 compatible.
It had been formatted on a Linux-driven Samsung smart TV.
Mageia 5.1 could not mount it. Installing exfat-utils made no difference, even following a reboot

However, under a virtual Windows 10 hosted via VMware Workstation 12.5.4 on the same Mageia 5.1 machine it has since been extensively written to.

With the VMware session stopped, or the partition not mounted there (so the
host system will see the drive), please post the output of (as root)
blkid /dev/sdx*

Replace the x with the appropriate device letter.

CC: (none) => davidwhodgins

[root@albury ~]# blkid /dev/sdb

/dev/sdb: UUID="86A0-2E70" TYPE="exfat"

as requested.

Missed the asterisk.
blkid /dev/sdb*

If there is no sdb1, that's the cause. The device does not have a partition
table of any kind, gpt or mbr, just a partition that occupies the entire device.

While that's valid, most gui or automated tools won't work without a partition
table.

Try manually mounting it.

# mkdir /run/media/sdb
# mount /dev/sdb /run/media/sdb

Then see if the files in it are visible.

# mkdir /run/media/sdb
mkdir: cannot create directory â/run/media/sdbâ: No such file or directory

# blkid /dev/sdb1

# mkdir /run/media/sdb
mkdir: cannot create directory â/run/media/sdbâ: No such file or directory

# mkdir /run/media/sdb1
mkdir: cannot create directory â/run/media/sdb1â: No such file or direct

#

(In reply to Alan Secker from comment #5)
> # mkdir /run/media/sdb
> mkdir: cannot create directory â/run/media/sdbâ: No such file or directory

Please try again with

# mkdir -p /run/media/sdb

This is the result:

# mkdir -p /run/media/sdb

# mount /dev/sdb /run/media/sdb

mount: unknown filesystem type 'exfat'

#

Install the package fuse-exfat too.

If that doesn't get the mount command working, try adding a line with vfat to
/etc/filesystems.

Auto mounting an exfat formatted usb stick is working on my Mageia 5 kde system,
even with the entire device formatted, rather than using a partition table.

It's just a matter of figuring out what needs to be added and/or changed on
your system to get it mounting there.

If you meant:

# mount -t vfat /dev/sdb /etc/filesystems

It returns: 

mount: special device /dev/sdb does not exist

/etc/filesystems is a text file. I've since confirmed that on Mageia 5 the
default does include vfat, so just confirm that fuse-exfat is installed.

On my system,
# rpm -qa|grep fat
exfat-utils-1.1.0-3.1.mga5
fuse-exfat-1.1.0-3.mga5

fuse-exfat was not installed, so I installed it.
Problem solved! 
Well done David.

Closing the report as invalid. It'll still show up in search results
for people looking for the solution.

Status: NEW => RESOLVED
Resolution: (none) => INVALID