Crucial MX100 not recognized in ENVY x360 15m-bp111dx

[Infinity_9999]

I recently picked up a new ENVY x360 (15m-bp111dx).  As it was replacing a laptop that had a dying screen, I wanted to move the SSD from my old laptop to my new one.  It's a Crucial MX100, which I know is a few years old.  But when I plugged it into the ENVY, the BIOS would only "see" it if I turned off UEFI and turned on legacy boot compatibility.  But even then, and hence the quotes, it wouldn't recognize that the drive was bootable or even an option to install Windows on, regardless of whether I had it cloned or whether I DISKPARTed it clean.  I had cloned the 1TB drive from the ENVY to it using Acronis, and I could see everything when I plugged the SSD into an external case on my desktop.  I even upgraded the SSD firmware just to rule that out.  Tools from Crucial confirmed that the drive was perfectly fine.

I realize that the list of supported SSDs in the manual isn't going to certify everything that ever was, but I'm struggling to understand why this laptop won't recognize it.  It's also making me leery of trying to find a new one that works as I don't want to pay the extremely high prices to buy direct from HP when I'm sure there's something on Amazon or Newegg that should be compatible.  Do I need TLC?  Or is MLC compatible?  And why would that even matter from a BIOS recognition standpoint?    

[Huffer · Accepted solution]

The MX100 is a bit old and was the source of many reported problems a few years back. We don't hear much about it any more but even the newer MX300 series still generates the occasional "help me it does not work" post here. 

Yes for 2.5 inch SATA SSDs you do not need to buy the part specified in the Service Manual. Samsung Evo 850s just do not have reported issues and I can tell you I just did an upgrade on an HP laptop using a Sandisk SSD Plus I bought on sale at Best Buy with the laptop. Success has been reported with the Western Digital Blue 2.5 inch SSDs. 

Post back with any more questions and please accept as solution if its the answer you needed. 

[Infinity_9999]

Thanks!  I'll take your suggestions and look for a new drive.  It's still frustrating that there doesn't seem to be a technical reason that I can find for why the laptop can't use the MX100, though.  Or maybe there is and I just haven't found it yet.   I just hate to have to spend the money on another drive when I know that the one I have is perfectly usable (at least in other machines).