Ok i have an Samsung NP550P7C-S02UK it came with an 1TB Samsung HDD, replaced it with my Crucial M4 128GB, I use Acronis True Image Home 2012 to make an image of the original hdd and then i copied it to the SSD. But whenever i use sleep mode and then wake the notebook withing 10 seconds i get a BSOD, and no data is written to the SDD, I copied the same image to an Seagate Momentus XT 250GB and i dont get a BSOD, when waking from sleep. I also did a clean install to the SDD with new downloaded drivers/software and i still get a BSOD, so it`s not the cloned image that`s the problem. The thing is i used this SDD with an Toshiba Satellite L855-118 exact same cpu, Ivy Bridge as well , made the same HDD to SDD copy, no problems I have the latest crucial firmware. I am currently using the Seagate Momentus XT 250GB, as the Samsung 1TB is too slow, but i get an clunking noise every 2 seconds from the Segate and it`s doing my head in. thanks for any help. John.