Just chiming in on recommended USB boot drives. I've seen
resources online recommending the SanDisk UltraFit USB 3 range. I think there honestly couldn't be a worse choice for FreeNAS boot drives.
I've killed 3 in a matter of weeks (camcontrol would spew media errors and timeouts and system would eventually die); until I realized 1) these drives get _really_ hot (after I noticed I could barely touch them immediately after power off, I measured over 60C casing temp with an IR cam while system was idle) and 2) they're only
rated for up to 35C operating temperature, which is ridiculously low (ambient temp in the summer can get higher than that where I live). They're absolutely NOT suited for 24/7 operation.
After a little bit of investigating I went for Kingston
DTSE9: yes it's Kingston, but they have a metal casing (certainly helps with thermal management), are fairly low profile, are rated for up to 60C operating temp and come with a 5-year warranty. Right now I've been happily using a USB2 thumbdrive with no problem whatsoever and I'll try the G2 (USB3) version soon (also rated for 60C operation), see if it's any good. With USB2 the boot is a bit slower but all my woes are gone, so I'm happy :)
I think it would be really nice to have a short list of known proven working devices from a few manufacturers in the guide.
HTH