Hi all, Just went through the same burden today (a 512GB Crucial M4 2.5" SSD failing all of a sudden), and this thread helped a lot. Around five minutes ago, following a mix of instructions from this read, I was able to see the SSD on a different computer using an external SATA adaptor and am now backing up all important files as I write. Thank you all very much! You saved around three years of work. Thanks again and remember to back-up your stuff! == Detailed procedure == [Failure description] The SSD was part of a Dell Precision M4800. I got to work on a regular Monday, docked the laptop on my table, booted it up and started working. I had to put it into Sleep and it never came back, same symptoms as everyone's: missing from BIOS and from the Boot menu. Placing a spare HDD/SSD in the disk slot works just fine, which makes me believe the Crucial M4 is faulty. [How I got it working] Used a spare work laptop and an external HDD case. This one uses a separate 5V power brick instead of a second USB plug for power, so I could leave it on for how long I wanted without plugging the USB cable to the laptop and avoid data connection while keeping it powered. After several power cycles, I left it on for about 15 minutes with the data cable plugged in. Windows suddenly sees the disk and allows me in, so I start backing up everything. It's acting kinda slow for an SSD, but it might be the anything from the SATA controller to the number of folders that need to be created during the copy.
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