please help, samsung t7 SSD limited to USB 2 speeds on M2

[deaconfrost]

Hi everyone,

My Samsung t7 2tb ssd is only able to connect at up to 480Mb/s to my MacBook m2 running Sonoma 14.4.

Any tips how to get it to negotiate at USB3.1 speeds? I have tried different cables and hubs and also only get up to USB2 speeds.
I have also tried booting into safe mode and no joy...

Thanks

 

[FreakinEurekan]

Try with a USB-C cable plugged directly into the Mac, with nothing else connected. If that’s the same, I’d be looking at the drive itself (well, the enclosure really) as the potential problem.

 

[deaconfrost]

Try with a USB-C cable plugged directly into the Mac, with nothing else connected. If that’s the same, I’d be looking at the drive itself (well, the enclosure really) as the potential problem.

Hi FreakinEurekan, thanks for the reply. I've tried that, I have got 2 of these t7 ssds and they bother negotiate at 480Mb/s. If I plug in my simple usb c dock it does the same...

 

[FreakinEurekan]

If it doesn’t work straight to the Mac, plugging in a dock in the middle isn’t gonna help. You’re using a straight USB-C cable from drive to Mac, with no adapters of any sort? If you’re using an adapter, get the proper cable.

If no adapters/hubs & still seeing slow speeds, try booting to safe mode and see if it’s working there. If not, create a new user account to test with.

 

[deaconfrost]

If it doesn’t work straight to the Mac, plugging in a dock in the middle isn’t gonna help. You’re using a straight USB-C cable from drive to Mac, with no adapters of any sort? If you’re using an adapter, get the proper cable.

If no adapters/hubs & still seeing slow speeds, try booting to safe mode and see if it’s working there. If not, create a new user account to test with.

yeah I plugged in the dock to see what speed it negotiates at, but that also negotiates at 480Mb/s. They all used to connect at 5Gb/s/ but now whatever I plug in seems to be limited. I dont know why it's changed. I use the same original cables...

 

[Fishrrman]

As odd as it may seem, it -might be- the cable.

As a "final resort", I'd try a cable sold as a "high speed USBc charging cable" that's rated for 1,000MBps speeds (or at least is supposed to be).

Also, before you give up on the cables you have, is it possible to try the drive and current cable(s) on a DIFFERENT Mac?

Also, try a different benchmark utility on it, and see what you get.

 

[deaconfrost]

As odd as it may seem, it -might be- the cable.

As a "final resort", I'd try a cable sold as a "high speed USBc charging cable" that's rated for 1,000MBps speeds (or at least is supposed to be).

Also, before you give up on the cables you have, is it possible to try the drive and current cable(s) on a DIFFERENT Mac?

Also, try a different benchmark utility on it, and see what you get.

thanks I guess ill have to try that Fishrrman, it will have to wait as im in a bit of a remote place, and nobody else uses Macs here. Ive used Blackmagic and it confirms getting around 40mb...

 

[Ben J.]

Make sure you have your bit and bytes in order in discussions like this.

MB = Megabytes
Mb = Megabits.

Gigabit vs Gigabyte: Why is Everything So Confusing? - Race Communications

Gigabit vs gigabyte can be confusing terms. We are here to help you navigate this piece of internet terminology.

race.com

My SSD has a read/write speed of about 1500MB/s.
It's connected to my mac via Thunderbolt3 which has a 40Gb/s transfer speed.

TB2, USB3.0, USB2.0 etc are all slower, often like 10Gb/s, 5Gb/s, I wasn't able to find a complete overview. Maybe someone can enlighten us. How fast is USB3.2, 3.1?

 

[MarkC426]

T7's come with a USB-C cable, do you have that..?
Mine give me ~800MB/s (in Ventura).

 

[deaconfrost]

T7's come with a USB-C cable, do you have that..?
Mine give me ~800MB/s (in Ventura).

yeah ive got those Samsung usb c to usb c cables that, I used to get much higher speeds ...im not sure what has happened, now that im limited to 480Mb/s...

 

[SkyFoxe42]

My T7 negotiated with my MBA M2 15" for a 10Mb/sec speed.
Used the USB-C cable that came with the T7.
No hassle at all.

 

[testato]

May be it is fake drive (check SN and usb vendor id), post the full report from system details . I have one of them and it work at 10 Gb (interface speed)

Do you have efi and apfs volume on it ?

 

[gilby101]

My T7 negotiated with my MBA M2 15" for a 10Mb/sec speed.

I hope you don't mean that.

 

[gilby101]

TB2, USB3.0, USB2.0 etc are all slower, often like 10Gb/s, 5Gb/s, I wasn't able to find a complete overview. Maybe someone can enlighten us. How fast is USB3.2, 3.1?

For USB, see https://en.wikipedia.org/wiki/USB. The first table is helpful. But note that Macs do not support 3.2gen2x2 (20 Gb/s).

 

[SkyFoxe42]

I hope you don't mean that.

Indeed, the speed obviously should be 10Gb/sec. Slip of the brain cell.

 

[Basic75]

Not all USB-C cables support higher than USB 2 speeds. And for those that do, just like previous USB cables and connectors, USB-C uses additional pins for USB 3/4 compared to USB 1/2. If your cable (or your port) has damaged USB 3/4 pins it might behave like a USB 1/2 cable.