11-09-2015 06:45 AM
Some users (like in this thread) are having issues on the Samsung 850 Evo not being recognized by the Y50-70's BIOS but for some reason the Samsung 840 Evo works well on this machine.
If you already have the SSD then you may want to try it out and if that doesn't work, try updating the BIOS from the Y50-70 drivers page and observe.
If you haven't ordered the drive yet though then you may want to go for the 840 Evo instead as others have successfully tried this on their Y50.
11-09-2015 08:09 AM
If you want fast response time when you load up the OS, apps, documents, and games then an SSD upgrade would be the way to go and just convert stock drive into an external drive by using a 2.5 SATA Enclosure (like this item).
However, if you require a bigger capacity hard drive, you can opt to get an 1TB SSHD or a 7200 RPM drive so you can at least have a good response time without sacrificing the drive capacity. You can then convert the stock drive into an external drive for additional storage.
11-09-2015 12:38 PM
Upgrading to an SSD would be a good investment as I've done the same on an old 2011 laptop and the performance increase were great (used an OCZ Vertex 450 coupled with upgrading the RAM to 8GB).
As for SSD's MTBF (Mean Time Between Failures) the Samsung 840 Evo has a Reliability MTBF of 1.5 million hours so as long as you enable TRIM and keep the machine well ventilated, the SSD will last years.