Hey guys as you probably already noticed there are a few people in this forum including me, who have massive problems with their SanDisk Ultra II SSD performance. I personally have the SanDisk Ultra II 960gb version and a Samsung 850 Pro 256gb version.
- The problem:
When I start my computer and check the sata link speed of my “SanDisk Ultra II SSD” via tools such as Crystaldiskinfo or even the SanDisk Dashboard software, everything seems to be fine and it shows 6gb/s connection speed.
However every time I restart my computer my “SanDisk Ultra II” changes from 6gb/s to 3gb/s in the Dashboard software, lowering my write and read performance by half. My Samsung SSD doesn’t have this problem and it’s speed isn’t affected by a computer restart. Many buddies of mine who bought the Ultra II as well noticed the exact same behaviour.
Dashboard shows that my speed is only 3gb/s:
And here is an actual speedtest after this bug occurred just to show that it’s not just read-out error:
- Other forum users with this problem:
After searching for help in this forum I came across other uses with exactly the same problem:
- Possible solution:
After countless hours of research, I managed to narrow the problem down. It appears that it is caused by FirmWare Version 41100RL, which all new SanDisk Ultra II SSDs are shipped with. Now I went on and searched the forums for other SanDisk SSDs and if they might have had similiar problems in the past and behold I actually found something.
The SanDisk Extreme Pro SSD actually had exactly the same problem as the Ultra II. If you look at the latest firmware update for the Extreme Pro SSD you can see that SanDisk fixed a Sata 2 speed bug for this model.
The release notes of this update state:
- Improved compatibility with certain systems where SATA link sometimes negotiated to SATA 2 vs SATA 3
Heres the full changelog of this firmware update:
As you can see, SanDisk was able to fix this bug with a simple firmware update and therefore It should be pretty easy for them to fix the SanDisk Ultra II SSD as well.
Here is also a video of a Extreme Pro SSD having the same problem as all current Ultra II SSDs from SanDisk:
(Take a close look at the SATA 600 speed changing to SATA 300 after a simple restart.)
I already contacted SanDisks support via E-Mail but i don’t think they are going to help me as their answers seem automated.
I would really appreciate if someone from their techsupport could dig deeper into this problem and tell us what’s going on, otherwise I think we have to return our SSD’s and get our cash back.