Sorry, from your original post it did not seem any troubleshooting had been done. Have you tried the power cycling technique to bring your SSD back to life?
FYI, If you were using hardware encryption on your SSD it may not show up normally with many utilities.
I mentioned the Win10 Spring Update as many people only get access to it months later and those updates do have a history of causing problems with SSDs.
I didn't see your second post earlier (2nd time today that has happened). If you were using any type of encryption on your SSD or the folder with the privileged data, then you should be safe when you RMA the drive. If your drive is not encrypted then you will need to put your trust in Crucial if you RMA the drive.
As for the SSD suddenly failing I have seen it happen more times than I like especially on the early models of popular name brand drives. I have only had one Crucial drive fail on me so far in that way. The SSD is a very complicated system as there is basically another computer in the drive and the internal technology keeps changing with every new product.
FYI, you can download the latest Windows 10 installer direct from Microsoft. I have used it successfully even on OEM systems. You do need a non-OEM key for the Win7 download though.
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I have a MX500 and it worked for the first two months. Then I got a blue screen crash. Upon reboot I tried to recover my windows installation from my SSD but it would not recover or repair. After putting in my old HDD drive and installing windows to that I was able to boot. However.... My SSD drive doesnt shown in my bios, it doesnt show in Disk Management and is missing from Device Manager. Upon playing around trying to fix this I discover it was showing as a USB drive on the `This PC` window. If I try to explore it I get told to insert a disk into the USB drive. I cannot format it. In device manager is shows as a USB drive in the Disk Drives section. I have also tried connecting it to a different SATA 3 port with the same problems. There is juice going into it and the computer is detecting it, but it thinks its a USB drive! It also doesnt show in Crucial Storage Executive and Acronis wont run as it wont detect a SSD drive in my system. Please can I ask if there is a way to resolve all of this?
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Was your SSD encrypted? If so you will need to unlock it before being able to access it to recover files or to repair or re-install Windows.
There is an automatic Startup Repair option on the Windows installer that may help and there are a few commands that can be run from it (chkdsk and sfc \scannow) to try and repair the filesystem or system files. It may even be possible to unlock an encrypted drive, but I'm not a Windows user so I'm not sure how you would do it.
Acronis is not able to identify your SSD as a Crucial device since the USB adapter is likely blocking this information or because it is encrypted. You can either install the Crucial SSD internally or you need to use another USB adapter (the Crucial USB to SATA Adapter should work). Unfortunately many USB adapters/enclosures/docks don't provide full functionality or even work with some hardware.
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