On the Raspi3 (with an SD card) you have to tell the Raspbpi3 to boot on the USB drive:

sudo echo program _usb _boot _mode=1 | sudo tee -a /boot/config.txt
sudo reboot

To verify that this has worked, type:

sudo vcgencmd otp _dump | grep 17:

The answer must be:

17:3020000a

The following shall be switched off cleanly:

sudo halt

Unplug the alim, remove the SD and replug the alim.

Source

I use this SSD disk on the Raspberry Pi3 which hosts Jeedom Master

Order on WDStore (02 December 2017)
WD PiDrive Foundation Edition 250GB Unit price: €31.90 Ordered Qty: 1		25,52€
WD PiDrive Foundation Bundle Edition Unit price: €0.01 Ordered Qty: 1		0,00€
Subtotal: 21,27 € Delivery: 0,00 € Tax: 4,25 € Total: 25,52 €

I use this hard drive, specially designed for Raspberry on my Raspberry Pi 3

The use of this hard drive makes it possible to avoid ‘cracking’ SD cards.

I ordered this disc on WDStore on 02 December 2017 (€25.52 in total)

I use the Raspberry PI 3 as a support to host Jeedom (Maitre).

I use it without an SD card, with a "External" disc (a WD PiDrive Foundation Edition 250GB)WD PiDrive Foundation Edition 250GB)

I have a Raspberry PI 2 and one Raspberry PI 3

The Raspberry PI 3 is the Jeedom Master

The Raspberry PI 3 is the Jeedom Slave

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