Getting back the "lost" partition of a USB Stick after the installation of Tails

 If you install the secure Linux Distribution Tails on a modern USB stick using Windows, you will likely no longer see the USB stick in Explorer.

That is nor suprising, as Tails removes all partitions (yes, all your data will be gone!) and then creates a 1.37 Gb primary partition where Tails will reside. The rest will remain free (without partition).

(Totally use this info on your own risk - you have been warned)

To fix this, just run good old diskpart (see also here) as an administrator.
In my example, the USB Drive is regonised as Disk 1:

DISKPART> LIST DISK 
DISKPART> SELECT DISK 1
DISKPART> CREATE PRIMARY PARTITION 

This creates a new Primary Partition in the remaining free space.
As soon as this is done, you may format this partition, typically extFAT is used for USB Sticks as FAT32 is too inefficient due to the limit on the number of blocks which would result in huge block sizes for large drives.