Hi,guys.I wrote this issues to Sandisk,and they answered:
Thanks for emailing SanDisk Technical Support. It is our goal to make sure you have all the resources you need to get the most from your product.
Regarding your issue, please be advised that this issue occurs with other brand SSD and HDD as well.
Unfortunately, there is no fix for it.
As far as we know, Apple only support drives that are pre-qualified in their systems.
If you have not installed TRIM, we recommend you to do an online search for available tools to install TRIM and see if this can resolve the issue.
If this solution does not work, then there is no other ways to resolve the issue. For the inconvenience caused, we sincerely apologize.
Meanwhile, as this is an issue of incompability, please note that SanDisk does NOT replace the product for incompatibility issue.
In this case, we recommend you to use this SSD on a compatible device.
So they think this issue is apple’s duty.But I want to know how can they say ‘this issue occurs with other brand SSD and HDD as well’?There are so many reports that other brand SSD is working fine.
I don’t think Sandisk want to solve this issue.