Chosen Solution
I install the Kingston ssd A400 480 gb to my MacBook Pro mid 2012 and it runs fine with Catalina but the Blackmagic speed test app tells me that it goes at 280 mbps like it was SATA ll but this Mac is compatible with SATA lll already activated TRIM but it goes the same, what should I do?
Did you change the HD cable and the drive, or just the drive? The cables in these vary wildly; some have the “thin” SATA II cable, while others have the thick SATA II or SATA III cable. As a general rule with these, throw the cable out and swap it with the SATA III revision to avoid these issues at the time of the SSD purchase. If you buy one used do it when you do other maintenance items like dust and thermal paste so you can say it’s “done” and then buy the drive when you’re ready and just install it. You’re going to want to with how cheap a good SSD is now and how miserable the original drives are. The exception to this rule is when the seller can prove they did it, but most of them don’t get it out of the way before they sell it unless it’s a machine they personally used and know about the problem. Think of it like this: if you know something is a ticking time bomb, do you wait until it blows and becomes a problem later, or fix it ahead of time? You would want to address it before it becomes a problem. Refer to this guide to change it.
I have never faced any issues maybe because I got it from BuyKingston. It’s working pretty well for me. Where did you buy it?
