Bramblejack

I personally have an MP510 480GB and have been facing the same issue as many other people on this forum. I have initially found a solution that soon proved to be temporary and in the longer run would be too much of a hassle to perform everytime. I found out that doing a secure erase on the disk brings back the write speeds to normal, but it obviously comes at a cost of having to backup your disk for the duration of the process (unless you don't care about the data on it). Before that, I have tried the powershell script that was supposed to do a zero-fill of the disk, but it did not work. However, I decided to give Defraggler a try. It has the Optimize feature, which in theory does propably the same thing as the script does, but somehow this function actually worked for me. It took just a few minutes and I didn't have to go through a whole process of cloning the disk and wiping it (which for me is even more trobule as it's my OS drive). I'm saying that it is a solution, but it's also not a definitive solution, however, performing it once in a while should not be a problem as much as any other method would be.

I have tried TRIM before doing a Secure Wipe and it helped for just a moment and even then the drive didn't get back to it's original write speeds. It jumped from 600Mb/s to 1600Mb/s, but after a reboot it just went back down to 600Mb/s. I've disabled Fast Boot now and let Windows 10 optimize the drive from now on. Few days after doing the Secure Wipe and the drive is holding up to it's max speeds so far.

I've been reading this thread in hopes of finding a solution, but I came up with it myself and it is pretty simple, yet it's not very convenient. All you have to do is perform a Secure Wipe through Corsair's SSD Toolbox. I said that it's not convenient and for obvious reasons. If you have a lot of data and a system on this single drive (it doesn't matter whether it's 480GB, 960GB or 1920GB) to keep all of if you have to clone the entire disk onto another one. Luckily, I've had a spare HDD lying around and used Macrium Reflect to clone my 480GB MP510. Once you've cloned it, perform a boot from the cloned drive, then Secure Wipe your Corsair drive and then clone the cloned drives back onto the Corsair drive. The write speeds should go back to normal, but god knows for how long. I personally can't tell when the issue appeared, but I've already performed two Windows installs since I have it and every time I only used Quick Format. Looks like if you're reinstalling your system it's a good idea to perform a Secure Wipe each time.