Write Speed on External USB C SSD is Slower Than Read Speed

[ondert]

On my wife's iMac (2017 4K w/ Radeon Pro 555) we're using Western Digital My Passport USB C 256gb external ssd as a boot drive since the internal 1tb hdd is ridiculously slow.
However, on Blackmagic Disk Speed Test I've seen the write speed is quite low compared to the read speed.
The ssd uses USB 3.1 port at 10Gbit/s. Is it related to TRIM? Is there anything I can do?
Thanks

 

[Juicy Box]

TRIM is the first thing that comes to mind.

How long did it take to have the slow write speeds since setting it up? Do you have access to any older Macs?

I have a theory on something to do to correct it, but I haven't had any of my USB SSDs' write speeds slow down yet to test it.

Older versions of Disk Utility had a lot more utility to them before they were nerfed, I think starting with El Capitan. The older version had many useful features that were removed.

One feature that could potentially be useful for the situation that you are is "Erase Free Space".

I don't know if it would work, but I thought that using this feature could be like a manual TRIM.

Even if it did work, you wouldn't be able to simply boot up into an old enough OS version that had this feature due to your iMac being relatively new.

If you had an older Mac, you could try it by putting your iMac in Target Disk Mode and connecting the two Macs.


If it is TRIM related, another fix would be to put your SSD into a Thunderbolt enclosure (or get a Thunderbolt SSD). You can enable TRIM with Thunderbolt, but not USB.

 

[Fishrrman]

Re "TRIM"...

I doubt it has ANYTHING to do with the speeds you're seeing at all.

The read speeds are EXACTLY where they should be with a USB3 external SSD.
The write speeds on an external USB3 SSD often vary with the drive's manufacturer, model number, and SIZE.
Smaller-capacity drives seem to be slower.

My guess is that the write speeds are about "all you're gonna get" from that particular drive. A DIFFERENT drive may yield better write speeds -- but remember, the reads aren't going to be any better than what you're seeing now.

In the real world (bootup, app loading, etc.) it's the read speeds that count. The exception would be tasks that maintain huge "working files" that require disk in/out activity. What does your wife USE the iMac for?

Questions:
If you ignore the test software, how does the computer RUN in day-to-day usage?
Is your wife complaining about it?

A 2017 iMac should have USBc/tbolt3, so if you want "faster", you could try:
- USB3.1 gen2 drive in the USBc port, which will give reads in the 960MBps range and writes over 800
- tbolt3 drive which will give reads/writes up towards the 2,000MBps range.

 

[Juicy Box]

Of course this may have nothing to do with TRIM, but I am thinking it might.

While there could be variations in manufacturers and sizes, I will post the disk test screen shots I have from two different SSD brands and sizes, and two HDDs in a SW RAID0 for comparisons to the OP's results.

All these drives are SATAIII drives, the SSDs are using a USB3 to SATA adapter, and the HDDs are internally from a MP which has SATAII.

Note: I didn't have any relatively new, single HDDs to test, so that is why I am using the RAID0 for comparison.


500GB Samsung 860EVO:


120GB ADATA SU650:



8TB WD Red HDDs in a SW RAID0 using SATAII:

If you just halve the write speed, you get about 167MBps for write speed for a single HDD. Just slightly slower than the OP's USB3.1 SSD.

The SSDs are pretty consistent. The Samsung is well used, but spent most of its life internally with TRIM Enabled. The ADATA is pretty new and barely used. Also keep in mind that the ADATA is considered a "budget" brand.

The OP's write speeds are really low imo. It is barely faster than my HDD. I am not sure if that is age, brand, or TRIM related. Or maybe some combination of above.

Just looking up reviews on the drive the OP has, typical write speeds are much higher than what the OP is getting.


But, @Fishrrman is correct by asking if your wife notices the slower write speed and what she does with the computer. If she isn't complaining, I wouldn't worry about write speed. Read speeds are much more noticeable.

If your wife uses the computer for simple tasks, email, web, word processing, I wouldn't worry about the write speeds at all.

Just remember to have a back up.

 

[theluggage]

However, on Blackmagic Disk Speed Test I've seen the write speed is quite low compared to the read speed

Write speeds on flash SSDs are slower than read speeds - it is a fundamental feature of the way SSDs read, write and (can't) overwrite data.

Also, write speeds will get worse as the disc fills up - read speeds not so much.

TRIM is part of the solution, as is SSD garbage collection (on some SSDs you need to leave them powered on but not being used to let garbage collection happen). Also, avoid letting them get anywhere near 100% full.

 

[BrianBaughn]

Using BMST on one of my SSDs I see pretty consistent read speeds but the write speeds go up and down during different parts of the test.

 

[Juicy Box]

Also, write speeds will get worse as the disc fills up - read speeds not so much.

While I had my 120 ADATA SSD still connected to my iMac, I decided to test this.

I copied 118GB over to it leaving to just 1.23GB free, just enough to do the 1GB stress test on BlackMagic. During the test, there was about 160MB of free space on the drive, so about 99.9% of the space was used while testing.

I tested it about 30 sec after I copied all the data, and it did have a huge effect on write speeds, almost as bad as what the OP posted. Also while testing, the write speed varied quite a bit, like 180MBps - 300MBps, not so steady like before.

Read speeds were slightly lower than when I tested it earlier, and slightly more varied, but nothing like the write speeds.

I was about to post my results on this thread, but got distracted with something, leaving my computer for about an hour. I decided to test the ADATA drive again when I got back, and the speeds improved a lot.

Almost back to normal, except the write speed isn't as steady as it was with it nearly empty. It varies a lot. Some writes might be lower than 200MBps, while most is above 300MBps.

I ran the BMDT for ten minutes without a break, and my write speeds would slow. If I would let it sit for a while, it seemed to improve the speeds for a while, but then the speeds would decrease again.

I have since deleted the stored data, and things haven't really improved much.

I would say that from my experiment, the speed of the SSD was hardly impacted by the disk being full, but impacted greatly from constantly using the disk.

This was only with one cheap SSD though....

read speeds not so much.

This was pretty much the case with my experiment.. While the read speeds did vary, it was just a relatively small difference.

 

[ondert]

Sorry for the late response, the issue still persists. My wife doesn't complain about the speed, I tried it and actually performs quite well.
Since it is usb ssd, it doesn't support TRIM as I know. Correct me if I'm wrong.
On my iMac, I use Jeyi TB3 nvme external closure and Sabret Rocket 1tb ssd. It supports TRIM since it uses TB3 interface.
Btw, the disk is not filled. More than half of it is empty.

I ran the software for a few times again, the read speed seems nice but the write speed is both slow and not persistent.

 

[Fishrrman]

OP:

To reiterate (hadn't realized I had posted earlier):
There's probably nothing you can do to change this
That's "just the way it is".
The write speeds may be a factor of what kind of memory the drive is using, etc.
I doubt "TRIM" has much to do with this. It's just "slower memory cells".

Having said that, your read speeds are EXACTLY where they should be.
430MBps is about "the max" you can get out of USB3 and UASP (USB attached SCSI protocol).

So long as your wife isn't complaining, I wouldn't worry about it.

 

[chrfr]

OP:

To reiterate (hadn't realized I had posted earlier):
There's probably nothing you can do to change this
That's "just the way it is".
The write speeds may be a factor of what kind of memory the drive is using, etc.
I doubt "TRIM" has much to do with this. It's just "slower memory cells".

Having said that, your read speeds are EXACTLY where they should be.
430MBps is about "the max" you can get out of USB3 and UASP (USB attached SCSI protocol).

So long as your wife isn't complaining, I wouldn't worry about it.

USB3 drives can perform at well over 430MBps on a 10Gbps connection, like the OP's 2017 iMac has. The Samsung T7, for instance, benchmarks at over 700MBps for writes and over 900MBps in read performance. It accomplishes this by using an NVMe drive connected to a USB bridge. SATA based drives like the T5 will be slower.

 

[Fishrrman]

Yes, chrfr, you are correct.
But to do faster than 430mbps, I think he's going to need something like:
- an nvme blade drive
and
- a USB3.1 gen2 enclosure.

That combination will easily yield reads around 960mbps and writes in the 850mbps range.
That's what I get with the one I put together.

 

[davidlv]

Yes, chrfr, you are correct.
But to do faster than 430mbps, I think he's going to need something like:
- an nvme blade drive and
- a USB3.1 gen2 enclosure.
That combination will easily yield reads around 960mbps and writes in the 850mbps range.
That's what I get with the one I put together.

Could you post some details as to the enclosure you mentioned and the NVME blade?
I am thinking of adding an external thunderbolt drive to my 2012 iMac which has Thunderbolt 1 ports, doable?
I remember reading a prior post of yours saying that Apple's Thunderbolt 3 to Thunderbolt 2 adapter won't let the drive get bus power. What the latest info on that?

 

[Fishrrman]

"I remember reading a prior post of yours saying that Apple's Thunderbolt 3 to Thunderbolt 2 adapter won't let the drive get bus power. What the latest info on that?"

Nothing's changed. I doubt it ever will.

You need USBc that is also capable of handling the tbolt3 protocol.
This means a 2017 or 2019 iMac. No adapter needed on these, just plug the tbolt3 drive in.
Earlier ones won't do.

davidlv --
If you have a 2012 iMac that has USB3, the best solution is a USB3 SSD.
Not much more to say about that.

 

[davidlv]

"I remember reading a prior post of yours saying that Apple's Thunderbolt 3 to Thunderbolt 2 adapter won't let the drive get bus power. What the latest info on that?"

Nothing's changed. I doubt it ever will.

You need USBc that is also capable of handling the tbolt3 protocol.
This means a 2017 or 2019 iMac. No adapter needed on these, just plug the tbolt3 drive in.
Earlier ones won't do.

davidlv --
If you have a 2012 iMac that has USB3, the best solution is a USB3 SSD.
Not much more to say about that.

Thanks. I didn't realize that the USB C ports on the later models were different. Good to know.
I have a Crucial MX500 512GB in a Transcend USB3 case. Using it as the boot disk, Speeds range frond 325-350MBps Writes to 425-450MBps Reads, which seems fast enough.
I have had trouble twice coming out of sleep, so currently I am booting from the 128GB Apple blade, which gets slower Writes at about 250MBps but good Reads at about 405MBps considering that the internal drive has trim, I have settled down to using that. Thanks again.

 

[Roxy.music]

Re "TRIM"...

I doubt it has ANYTHING to do with the speeds you're seeing at all.

The read speeds are EXACTLY where they should be with a USB3 external SSD.
The write speeds on an external USB3 SSD often vary with the drive's manufacturer, model number, and SIZE.
Smaller-capacity drives seem to be slower.

My guess is that the write speeds are about "all you're gonna get" from that particular drive. A DIFFERENT drive may yield better write speeds -- but remember, the reads aren't going to be any better than what you're seeing now.

In the real world (bootup, app loading, etc.) it's the read speeds that count. The exception would be tasks that maintain huge "working files" that require disk in/out activity. What does your wife USE the iMac for?

Questions:
If you ignore the test software, how does the computer RUN in day-to-day usage?
Is your wife complaining about it?

A 2017 iMac should have USBc/tbolt3, so if you want "faster", you could try:
- USB3.1 gen2 drive in the USBc port, which will give reads in the 960MBps range and writes over 800
- tbolt3 drive which will give reads/writes up towards the 2,000MBps range.

Is it possible to put Trim on an external drive as I use one for the os as the internal one is only 256 GB but that one is super fast. And can you tell me why a new drive should have so many X,s on it? the write speeds go as low as
25mg?i am using the TH3 connection.the lowest read speed is 680 .

 

[cynics]

Is it possible to put Trim on an external drive as I use one for the os as the internal one is only 256 GB but that one is super fast. And can you tell me why a new drive should have so many X,s on it? the write speeds go as low as
25mg?i am using the TH3 connection.the lowest read speed is 680 .

There is no mainstream way of using the trim command over the USB protocol on MacOS.

Just ignore that benchmark IMO. Its fun to see but its not representative of real world performance with random read write speeds, various files sizes, various queue depth, IOPS etc etc. I'll just rant about it for a bit....

I can tell you why there are so many X's, because no one has a good consumer storage speed benchmark for MacOS I guess?

Disk Speed Test is a benchmark made by a professional videography equipment company (Blackmagic Design) specifically for video editors requirements to specifically best emulate a true video editing workload on dedicated video editing storage solutions. Don't get me wrong, if you want to edit 4k60 without a proxy and you don't know if you computer can do its a great tool, matter of fact thats its specific intention.

I mention 'specific' and 'video' a couple times because of how silly it is for us to use it for anything other than its intended purpose. Its fun to see how fast the new Mac SSD is each year but its results don't tell you anything, matter of fact it can be false information for your workload. For example, some SSD's use data compression to reach their advertised write speeds. With consumer use that is what you'll get in real life, even in other professions because small files with low density transfer differently than large video files that typically can't be losslessly compressed by their very nature. Blackmagic claims some drives will report write speeds UP TO 50% slower then you'd get with other workloads. So maybe Blackmagic said your drive is 20% slower because it has data compression, maybe it doesn't, maybe its trim, maybe its failing. Disk Speed Test can only tell you there might or might not be an issue.....aka nothing.

That bottom right most X is a video file and that requires a non stop 10Gbps (~1.25GBps) read speed plus a bit for overhead just to view it at full resolution. If all the resolutions, chroma detail, color profiles, and frame rate data consuming more than half of the Blackmagic's main window wasn't enough, the fact a 4k60 10bit YUV 422 video played back in real time would fill up your 256GB drive in under 2 minutes should be enough to tell us its more eye candy or intended for someone with that requirement in mind but nothing in between.

/rant sorry

 

[Juicy Box]

On my wife's iMac (2017 4K w/ Radeon Pro 555) we're using Western Digital My Passport USB C 256gb external ssd as a boot drive since the internal 1tb hdd is ridiculously slow.

Of course this may have nothing to do with TRIM, but I am thinking it might.

An Update to this for the OP. There was a thread with someone with internal drives on a Mac Pro with a very similar situation as you. Their write speeds were very low, but they didn't know about TRIM.

Enabling TRIM instantly fixed that person's write speeds:

Understanding SSD vs HDD Sata II speeds

Hey all, I'm just working on some upgrades for my 5,1 - so far been successful with USB 3.0, x2 cpu upgrade, 580 gfx and NVMe SSD. One thing I can't quite figure out is the speed descrepency in the default bays. Though limited to Sata II speeds I was still expecting the SSD to be performing...

forums.macrumors.com

While TRIM might be the issue for you, the solution of enabling TRIM doesn't help if you continue to stick with the USB drive. TRIM can be enabled on a TB drive, though.

Could you post some details as to the enclosure you mentioned and the NVME blade?
I am thinking of adding an external thunderbolt drive to my 2012 iMac which has Thunderbolt 1 ports, doable?
I remember reading a prior post of yours saying that Apple's Thunderbolt 3 to Thunderbolt 2 adapter won't let the drive get bus power. What the latest info on that?

I wish I would have seen this post earlier, as sometimes there is inaccurate/incomplete info being spread around about TB3 on older Macs with TB1 or TB2.

I have a Late 2012 iMac, and there are faster external solutions than USB3.

My current setup is using a NVMe in a Samsung X5 Thunderbolt 3 Enclosure that I use for my boot drive. This is connected to a cheap TB3 dock (providing power to the X5), then to the iMac's TB1 port using Apple's bidirectional TB2>TB3 adapter.

With the NVMe that came with the X5, I was getting write speeds over 800MBps and read speeds @ 900MBps. Way faster than USB3. I swapped the NVMe for a larger size, and read speeds are the same, but for some reason the write speed dropped a little on the newer and larger NVMe, but @ 730MBps, it is still way faster than USB3 and the internal SSD.

It is accurate to say the Apple's bidirectional adapter doesn't provide power over the bus, but if you have a TB3 device that can provide its own power, or if you have a TB3 dock with its own power supply, then this doesn't matter.

BTW, if I could do my set up all over again (which I might do anyways), I would just spend a little more and get an TB3 NVMe enclosure with its own power supply, as I think the TB3 dock is adding to the overhead. I think if I just spent more and got a powered enclosure, I would have seen speeds over 1000MBps.

 

[Roxy.music]

There is no mainstream way of using the trim command over the USB protocol on MacOS.

Just ignore that benchmark IMO. Its fun to see but its not representative of real world performance with random read write speeds, various files sizes, various queue depth, IOPS etc etc. I'll just rant about it for a bit....

I can tell you why there are so many X's, because no one has a good consumer storage speed benchmark for MacOS I guess?

Disk Speed Test is a benchmark made by a professional videography equipment company (Blackmagic Design) specifically for video editors requirements to specifically best emulate a true video editing workload on dedicated video editing storage solutions. Don't get me wrong, if you want to edit 4k60 without a proxy and you don't know if you computer can do its a great tool, matter of fact thats its specific intention.

I mention 'specific' and 'video' a couple times because of how silly it is for us to use it for anything other than its intended purpose. Its fun to see how fast the new Mac SSD is each year but its results don't tell you anything, matter of fact it can be false information for your workload. For example, some SSD's use data compression to reach their advertised write speeds. With consumer use that is what you'll get in real life, even in other professions because small files with low density transfer differently than large video files that typically can't be losslessly compressed by their very nature. Blackmagic claims some drives will report write speeds UP TO 50% slower then you'd get with other workloads. So maybe Blackmagic said your drive is 20% slower because it has data compression, maybe it doesn't, maybe its trim, maybe its failing. Disk Speed Test can only tell you there might or might not be an issue.....aka nothing.

That bottom right most X is a video file and that requires a non stop 10Gbps (~1.25GBps) read speed plus a bit for overhead just to view it at full resolution. If all the resolutions, chroma detail, color profiles, and frame rate data consuming more than half of the Blackmagic's main window wasn't enough, the fact a 4k60 10bit YUV 422 video played back in real time would fill up your 256GB drive in under 2 minutes should be enough to tell us its more eye candy or intended for someone with that requirement in mind but nothing in between.

/rant sorry

Thanks for all that it is because all those people on utube showing there drives so fast, but you explained it well i need not worry about it It is a new drive i am using only been using it a few weeks. I did try it on the USB port and it is a lot slower as i would expect..Hope your weekend is going well whats left of it.

An Update to this for the OP. There was a thread with someone with internal drives on a Mac Pro with a very similar situation as you. Their write speeds were very low, but they didn't know about TRIM.

Enabling TRIM instantly fixed that person's write speeds:

Understanding SSD vs HDD Sata II speeds

Hey all, I'm just working on some upgrades for my 5,1 - so far been successful with USB 3.0, x2 cpu upgrade, 580 gfx and NVMe SSD. One thing I can't quite figure out is the speed descrepency in the default bays. Though limited to Sata II speeds I was still expecting the SSD to be performing...

forums.macrumors.com

An Update to this for the OP. There was a thread with someone with internal drives on a Mac Pro with a very similar situation as you. Their write speeds were very low, but they didn't know about TRIM.

Enabling TRIM instantly fixed that person's write speeds:

Understanding SSD vs HDD Sata II speeds

Hey all, I'm just working on some upgrades for my 5,1 - so far been successful with USB 3.0, x2 cpu upgrade, 580 gfx and NVMe SSD. One thing I can't quite figure out is the speed descrepency in the default bays. Though limited to Sata II speeds I was still expecting the SSD to be performing...

forums.macrumors.com

While TRIM might be the issue for you, the solution of enabling TRIM doesn't help if you continue to stick with the USB drive. TRIM can be enabled on a TB drive, though.




I wish I would have seen this post earlier, as sometimes there is inaccurate/incomplete info being spread around about TB3 on older Macs with TB1 or TB2.

I have a Late 2012 iMac, and there are faster external solutions than USB3.

My current setup is using a NVMe in a Samsung X5 Thunderbolt 3 Enclosure that I use for my boot drive. This is connected to a cheap TB3 dock (providing power to the X5), then to the iMac's TB1 port using Apple's bidirectional TB2>TB3 adapter.

With the NVMe that came with the X5, I was getting write speeds over 800MBps and read speeds @ 900MBps. Way faster than USB3. I swapped the NVMe for a larger size, and read speeds are the same, but for some reason the write speed dropped a little on the newer and larger NVMe, but @ 730MBps, it is still way faster than USB3 and the internal SSD.

It is accurate to say the Apple's bidirectional adapter doesn't provide power over the bus, but if you have a TB3 device that can provide its own power, or if you have a TB3 dock with its own power supply, then this doesn't matter.

BTW, if I could do my set up all over again (which I might do anyways), I would just spend a little more and get an TB3 NVMe enclosure with its own power supply, as I think the TB3 dock is adding to the overhead. I think if I just spent more and got a powered enclosure, I would have seen speeds over 1000MBps.

.




I wish I would have seen this post earlier, as sometimes there is inaccurate/incomplete info being spread around about TB3 on older Macs with TB1 or TB2.

I have a Late 2012 iMac, and there are faster external solutions than USB3.

My current setup is using a NVMe in a Samsung X5 Thunderbolt 3 Enclosure that I use for my boot drive. This is connected to a cheap TB3 dock (providing power to the X5), then to the iMac's TB1 port using Apple's bidirectional TB2>TB3 adapter.

With the NVMe that came with the X5, I was getting write speeds over 800MBps and read speeds @ 900MBps. Way faster than USB3. I swapped the NVMe for a larger size, and read speeds are the same, but for some reason the write speed dropped a little on the newer and larger NVMe, but @ 730MBps, it is still way faster than USB3 and the internal SSD.

It is accurate to say the Apple's bidirectional adapter doesn't provide power over the bus, but if you have a TB3 device that can provide its own power, or if you have a TB3 dock with its own power supply, then this doesn't matter.

BTW, if I could do my set up all over again (which I might do anyways), I would just spend a little more and get an TB3 NVMe enclosure with its own power supply, as I think the TB3 dock is adding to the overhead. I think if I just spent more and got a powered enclosure, I would have seen speeds over 1000MBps.

TRIM can be enabled on a TB drive, though [/QUOTE]
How do you enable Trim on an external drive?
I was told you can only enable an internal drive?
I was thinking of getting a TH3 drive., mind you there so few out there one,s where you put your own drive in there.
Why are,t all SSD,s enabled with Trim reading about Trim SSD,s enabled Trim last longer. There are the ones I,m am thinking about.
TREBLEET Thunderbolt 3 SSD Enclosure
I am a bit off by the second one the guy talks about I have read reviews saying that it loses connection I don,t know if it would still lose the connection if I used this heatsink with it I can get it for £95 on eBay the heatsink is £23 total
£118 while the first one costs Has anyone any of there?

with the heatsink
TREBLEET is £130.27 because it is from the USA so I have to pay for all that duty.
Sabrent M.2 2280 SSD Rocket Heatsink (SB-HTSK)
Or I could go for this one TEKQ CUBE Thunderbolt 3 that only has 4 reviews on Amazon.£117
WAVLINK Thunderbolt 3? with the heatsink

 

[Roxy.music]

. Wavlink TH3
Sabrent heatsink. it would have to be gaffer taped to the Wavlibk

. Tekq cube

 

[Juicy Box]

How do you enable Trim on an external drive?
I was told you can only enable an internal drive?

Why are,t all SSD,s enabled

TRIM cannot be manually enabled on USB enclosures, but can for TB Enclosures. I have a few external SSDs that have TRIM enabled, and this can be checked using the system report.

A side note, some SSDs already have TRIM (or something similar) and do not need it enabled. According to OWC, the performance of their SSDs could be reduced with TRIM enabled.

When you find a particular SSD you are interested in, just do a search to see if it can have TRIM enabled or if there are any problems with enabling TRIM on it.

 

[ondert]

Oh guys, btw, I bought another Jeyi TB3 nvme enclosure from AliExpress for my wife also. Now, it works rock solid with an XPG 8100 series 512gb ssd. TRIM via USB connection simply didn't work for me. I forced enable trim but nothing happened as expected.

 

[Roxy.music]

Oh guys, btw, I bought another Jeyi TB3 nvme enclosure from AliExpress for my wife also. Now, it works rock solid with an XPG 8100 series 512gb ssd. TRIM via USB connection simply didn't work for me. I forced enable trim but nothing happened as expected.

I am glad you are happy with the enclosure. As far as Trim is concerned I don,t see why all SSD,s are not enabled with it as standard. I have never heard of the make Jeyi?is the wife happy with the speeds of it and what speeds is she getting from it?

 

[Juicy Box]

TRIM via USB connection simply didn't work for me.

Yeah, enabling TRIM won't work for anyone using USB, but it will with TB.

What are the write/read speeds with your new TB drive? I am sure it is significantly better than your old one.

 

[ondert]

The product is this;

TRY 565.16 | JEYI thunderbolt 3 m.2 nvme Enclosure mobile box case NVME TO TYPE-C aluminium TYPE C3.1 m. 2 USB3.1 M.2 PCIE U.2 SSD LEIDIAN-3

TRY 565.16 | JEYI thunderbolt 3 m.2 nvme Enclosure mobile box case NVME TO TYPE-C aluminium TYPE C3.1 m. 2 USB3.1 M.2 PCIE U.2 SSD LEIDIAN-3

a.aliexpress.com

There was a topic of this on forum. The speeds I got with an XPG SX8100 512gb are nice on my wife’s ve 2017 4K iMac;

 

[Roxy.music]

The product is this;

TRY 565.16 | JEYI thunderbolt 3 m.2 nvme Enclosure mobile box case NVME TO TYPE-C aluminium TYPE C3.1 m. 2 USB3.1 M.2 PCIE U.2 SSD LEIDIAN-3

TRY 565.16 | JEYI thunderbolt 3 m.2 nvme Enclosure mobile box case NVME TO TYPE-C aluminium TYPE C3.1 m. 2 USB3.1 M.2 PCIE U.2 SSD LEIDIAN-3

a.aliexpress.com

There was a topic of this on forum. The speeds I got with an XPG SX8100 512gb are nice on my wife’s ve 2017 4K iMac;

View attachment 938022

It seems very cheap for a TH3 drive at just over 60 pound uk price
Does it disconect?
She is using it as a OS drive?That is good speeds If it does not disconnect i will buy it.
I have ordered it Very cheap hope it is good. I have a 2017 IMAC but it is the 5k modal. I think i must have been the last person to get a coupon.