SSD stopped working suddenly. Any chance of data recovery?
Solution 1:
With SSDs its highly unlikely that you'd be able to get and data back unless it decides to be recognised again. I would try hot plugging it to a Linux computer watching the output of syslog (or wherever kernel measages go to on your machine)
Replacing the controller will not work, as it contains memory of how the data is mapped onto the NAND flash.
As a last resort I'd recommend putting the drive in cold and dry environment for a little bit. As weird as it sounds electronics work better at lower temperatures. take care to minimise condensation however.
When you do connect it back up, start copying data as fast as possible, with dd preferably.
If the data is truely important, you should consider data recovery company