@huber70
Did you buy this power supply?
https://www.raspberrypi.com/products...-power-supply/
Then it should be possible to use a 2.5" SSD.
I made my own with a u-green USB 3 case and Kingston 128GB SSD.
Installed Raspberry OS on it, and I am able to boot from it and still have enough space for e-book data (I use it only for testing, not for "production").
If it's still an empty USB stick it should be formatted as exFAT, not as NTFS.
For Raspberry Pi use exFAT (NTFS is possible but then you need more copy/paste.
1 - check the format on your PC. If needed format as exFAT and put a calibre library on it.
2 - connect the USB stick to the blue port on your Raspberry Pi.
3 - In a terminal on your Pi: (to manually mount to see if it works)
Code:
sudo mkdir /mnt/USB
sudo mount /dev/sda1 /mnt/USB
cd /mnt/USB
ls
Do you see the calibre library?