T7 Shield 4TB drives were FAST - Now Extremely SLOW

[cableguy1970]

I have (4) T7 Shield SSD Drives, 4TB size, and all four used to work flawlessly. Now attempting to save data to any of the drives they are going slower than dialup. Over 4 hours to save 4GB. I've used Samsung Magician to ensure all drives have the latest firmware (FXI72P2Q). It's odd that they all are performing exactly the same way. I've used two different Mac computers with the same results: 16" MBP M3 Max, 48 GB Memory and Sequoia 15.4 installed. 2nd Mac is a 16" MBP M2 Max, 96 GB Memory installed. I also have a Samsung T9 SSD, and it's just as slow. Any help would be greatly appreciated.

[TomaszHorski]

This is permanent fix or only for few hours/days? I can still use second RMA.

[coloradobittersweet]

Well, I have now 'fixed' 4 of my drives and the first one is still saying it is fast.  I have no idea how long they will stay fast or what makes them change to slow.  Any, my dad started buying other brands of 4TB drives because of this problem. 

[Dave98]

I have 5 of these drives, all the same behavior, and it's killing my ability to get client work done. Is there an official fix yet or am I buying crucial from now on?

[TomaszHorski]

No any fix from Samsung. Only silent. 

[cableguy1970]

Samsung doesn't seem to care about their customers. The drives were amazing for the first month, then they just downshifted to dialup speed. No comments or concerns on their end. I wonder what would get their attention?

[TonyYau]

I'm having the same problem. I have a T7 Shield 4TB, and I'm using a 2021 MacBook Pro M1 Pro. When I first plug the T7 in, copying files is very slow; it takes a while to recover. Also, using the Samsung Magician benchmark, the random write IO is extremely low, only around 1000. I hope Samsung will take this seriously and resolve this issue.

[262626]

My Samsung T7 4TB SSD (latest firmware, 1.37TB free space) write speed suddenly drops to 2MB/s. I have to run Samsung Magician Performance Test to get the speed back to 860MB/s. Eject the SSD and use it on another Mac, speed slows to 2MB/s again. This happens on 3 Macs, using Apple TB4 and 5 cables.

My Samsung T7 2TB, T5 500MB, Crucial X10 4TB, SanDisk 2TB SSD don't have this problem on any of my Mac.

[Deyson]

I am experiencing the same issue with four T9 Drives, achieving only 2MB write speeds and 772 Read speeds.
Using the cables it came with.  Samsung drives were the most recommended drives when I first purchased them 1 year ago. Hopefully, there will be a solution to this soon. 

[ziga]

Same here. Exactly 2MB/s. Obviously some software/driver/firmware issue. About to buy a magnetic USB drive as a replacement.

[ziga]

Update: after some three hours of brute force copying at 2MB/sec the speed picked up and is now normal ... 600MB/sec+. The drive was shelved for months before that.