My Crucial SSD is having detection issue (intermittent detection in BIOS or OS) 

Most of the time, SSD detection issues are resolved by firmware update. However, you may need your computer to detect the SSD in BIOS before applying the update.

Firmware Download --> Crucial Download Site 

Possible Workarounds:

1. Attempt to force detection through BIOS. Depending on your Motherboard, you may "force" BIOS to attempt to detect the SSD.

2. Use on a different PC, or one with older, SATA 3.0Gbps (SATAII) connection. 


Please don't use a SATA to USB (more commonly called SATA enclosure), as these devices might not correctly pass on firmware update properly and might damage your SSD permanently.