USB4 Extreme Pro 4 TB USB 3.2 2x2 connectivity speed

Portable SSD Portable | Extreme | Extreme Pro SSD
1

I see that there is now a USB4 capable Sandisk Extreme Pro 4 TB drive available. Model SDSSDE82-4T00-G25.

If you connect this to a 20 Gb/second USB 3.2 2x2 computer port, how fast will it operate?

That is, will is communicate at the 20 Gb/second rate, or will it fall back to the slower plain old USB 3.2 Gen 2 (non 2x2) 10 Gb/second rate?

The older ‘regular’ model (SDSSDE81-4T00) will operate at the USB 3.2 2x2 20 Gb/second speed, so I was hoping that this capability wasn’t lost on the new model.

Thanks.

2

@SomeOtherGuy Some USB4 (40 Gb/s) ports only support USB 3.2 Gen 2 (10 Gb/s).
They are not backwards compatible with USB 3.2 Gen 2x2 (20 Gb/s) and will get slower speeds. In short, the max speeds depends on the manufacturer backward compatible implementation.

Have you checked our knowledge base articles?
(Get Support for Your SSDs and Flash Products | SanDisk)

Try this one.

Have you opened a Support Case?
If not, contact SanDisk Technical Support for assistance.
(Contact Support | SanDisk)

3

Yes, I understand that (USB4 computer ports are not required to support the 20 Gb/sec speed, but some may).

But I’m not asking about connecting the USB 3.2 2x2 version of the Extreme Pro to a USB4 port.

What I want to know is what happens when you connect the just released USB4 version of the Extreme Pro (which supports connection to a USB4 computer port at 40 Gb/sec.) to a computer port that only supports USB 3.2 2x2 ( at 20 Gb/second).

My understanding is that this might work at the full 20 Gb/second speed in that setup, or it could conceivably only operate at an interface speed of 10 Gb/sec.

My understanding is this depends on the support built in to the USB4 version of the Extreme Pro (model SDSSDE82-4T00-G25).

I was thinking about buying the new USB4 version of the Extreme Pro and using it on two different computers. One with USB4 ports, and one whose fastest port is USB 3.2 2x2.

If the new USB4 version of the Extreme Pro would only operate at 10 Gb/sec. on the one with only a USB 3.2 2x2 port, then that limits the speed of moving data from my USB4 port equipped computer to the slower one.

(On my current setup, my computer with a USB4 port will operate my ‘old’ 2x2 Extreme Pro at 20 Gb/second. But again that’s not my question).

P.S.- The article at “Learn how to resolve…” only seems to show a row for the ‘old’ non-USB4 version of the extreme pro.

4

Yes, the SanDisk Extreme Pro 4TB (SDSSDE82-4T00-G25) supports USB 3.2 Gen 2x2

so when connected to a 20 Gb/s USB 3.2 2x2 port it should operate at the full 20 Gb/s speed.

You won’t have to worry about it falling back to 10 Gb/s unless the port or cable doesn’t support 2x2 properly.

I hope that helps! :blush: