Hi there! I know there have been a load of threads about SSDs and MacBook Pro and TRIM - but my question and situation is slightly different. I am a travel photographer and have had my MBP (mid-2012) since it was first released. Last week, the HDD began to show signs of mechanical failure (the continuous loud clicking noise etc.) so I decided to back up (and clone, just in case) my HDD and replaced it with a Crucial MX300 275GB SSD. So far, everything has been installed smoothly, both the SSD and mac OS Sierra as well (its quick!) I am off to Japan for 2 months on a photo assignment (usually they last 2 weeks, but this is a big one!) and I will be doing a lot of photo editing in Adobe LightRoom, as well as backing up photos and deleting them. Speed is not such an issue for me, it is more the fact of ensuring that a block on the SSD is actually freed to be written to once deleted, and ensuring there is no data loss. The question is; do I need to enable TRIM via Terminal, or will the Garbage Collection function in the SSD firmware work just as well? Bear in mind that I will be doing a lot of deleting of photos (getting rid of the rubbish photos ), before backing them up, as well as photo editing. If it is the case of GC working just as well without TRIM enabled, then UNticking "put hard disks to sleep" in energy preferences and leaving the MBP on the login screen overnight will allow GC to function during idle time? Thanks for your help and input! JJ.