Acronis is a good one that properly aligns ssds when imaging to them.
You could also just load Windows on the spare hdd temporarily or use a different pc.
, I looked for firmware updates and found an update for the SSDs (20001L00 - A10), but after installing these updates, I still see controller errors. If necessary I will request replacement motherboards and SSDs for pretty much all of them.
I am about to reimage them to see if that affects anything, and I'm pulling the SSDs from about 9 of them and installing old 1 rpm SATA hard drives from the surplus parts pile, to see if that makes any difference.
Those capable can update their Linux or Mac 840 EVOs connected as a secondary drive under Windows with Magician 4.6 installed.
And if so what does that imply about the state of this software? Why restrict the number of downloads from the webpage?
Restarting Magician may force it to re-check and get the update.
Linux and Mac users are not yet able to update as the ISO updater has not been released for the new firmware.
Once installed, you *should* be able to use Magician to update the firmware on your 840 EVO and (hopefully) see its performance come back to where it should be.
There have been some reports of users unable to update, but that appears to be Samsung's servers being hammered and Magician's default / timeout is to report that you are on the latest firmware.