http://forum.crucial.com/t5/Crucial-SSDs/Why-did-my-SSD-quot... > "A sudden power loss is a common cause for a system to fail to recognize an SSD. In most cases, your SSD can be returned to normal operating condition by completing a power cycle, a process that will take approximately one hour.
We recommend you perform this procedure on a desktop computer because it allows you to only connect the SATA power connection, which improves the odds of the power cycle being successful. However, a USB enclosure with an external power source will also work. Apple and Windows desktop users follow the same steps.
1. Once you have the drive connected and sitting idle, simply power on the computer and wait for 20 minutes. We recommend that you don't use the computer during this process.
2. Power the computer down and disconnect the drive from the power connector for 30 seconds.
3. Reconnect the drive, and repeat steps 1 and 2 one more time.
4. Reconnect the drive normally, and boot the computer to your operating system. "