The car only writes at 2MB/s, there's no need for a "fast" drive- especially when the USB ports are only USB2 anyway.
As to space, 128GB is MORE than plenty for sentry... the car uses ~7.2 GB for the 1 hour continuous circular buffer, and each 10 minute sentry recording (or manually saved 10 minute recording) is ~1.2 gigs total space.... so 128GB would be enough for roughly 100 recordings plus the buffer before it got full.... and with the ability to view and delete right on the car I can't imagine it ever getting even half that full.
(even before you could delete locally I'd pull my 128GB key out every 3-4 months to clear it off and it was usually 1/3rd-1/2 full)
The owners manual recommends 2 specific models of USB key, I've run the 128GB of one of those for over 18 months with no issues, this guy here:
https://www.amazon.com/gp/product/B07D7PDLXC/
Currently 23 bucks on Amazon.
Regarding ports- cars built since June 4 this year will have one USB-C that the built-in wireless charging pad plugs into, and one empty USB-A you can plug a flash drive into for dash cam.
If you require more than one USB-A port to allow for a wired phone charger allow me to recommend one of these two options:
If you require a single extra USB-A port just for dashcam:
https://www.amazon.com/Navak-Splitt...=1&keywords=navak+tesla&qid=1595898279&sr=8-1
Plugs into OEM USB-A port and provides one 2.1 amp USB-A charging port, and 1 400mA data port for a USB storage device.
If you require a place for dashcam storage and TWO USB-A ports (say for a phone charger, and for either a game controller, or a USB key holding music) then get this:
https://www.amazon.com/Navak-Combo-Adapter-Tesla-Model/dp/B08B3FY8X8
Plugs into same OEM port, provides one SDcard slot for dashcam storage. one 1.5 amp USB-A charging (and data) port for phone charging, and 1 500mA data port for music key/game controller/whatever.
Both spliiters are designed by a user here, who offers excellent support, and unlike most "dumb" hubs actually has real logic inside to provide promised level of power/function in each spot... (the dumb 4-port hub they replaced for example limited you to 0.9 amps on any port)
If going with option 2 (I was a beta tester for it) I've used this SDcard with no issue:
https://www.amazon.com/gp/product/B07B984HJ5/