How to delete USB HDD partitions?

I have a router where you can connect a USB storage medium to use it as a network storage. Works great too.

Now to my problem, I have a 2.5 "HDD on the Windows was / is installed (old laptop) and can connect them only via USB with my PC because no SATA cable exists. The data on it I do not care, so I want it completely Formatting, but my problem is, I can only format one of three partitions or even change anything (Windows Disk Management)

How can I delete all 3 partitions and put them together?

Just download a partitioning program, most of them have a free trial period.

The example:

https://www.paragon-software.com/de/free/pm-express/

Sorry, google begs me to take the new link

Diskpart is your friend

https://www.intel.de/content/www/de/de/support/articles/000022179/memory-and-storage.html

Click "Delete Volume" - you have to do it for each partition.

Once all are deleted, you can merge and format them together

See prnt.sc link, is not selectable (at least with the 2 small not, only with the large)

The program will probably verar ***** me. Require that I create an account and then will not accept and a new one.

Nevertheless, thanks for the suggestion.

Then it was fake again, sorry, google apparently shows everything except the original.

Have rather than quickly format just completed a complete formation. Takes about 2h RIP

Well anyway thanks, I hope that's worth the wait.

That's why you do it quickly with diskpart