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I have a Thinkpad P50 and I am planning to buy and install a M2 SSD drive on it.

The laptop has two built-in M2 SSD slot.

  • M2 SSD slot #1: The laptop came with a M2 SSD with OS installed on it.
  • M2 SSD slot #2: I am planning to buy and install a Samsung 850 EVO - 1TB - M.2 SATA III Internal SSD (MZ-N5E1T0BW) (http://a.co/6SJ5ZyY)

I have installed lots of IDE or SATA drives on laptops in past 20 years. SATA drives are quite easy to install and I have not had any compatibility issue with and SATA drive.

Also, I have been installing and using Samsung SSD SATA drives with no issue and they have been compatible with all PCs (or laptops) I had - even the older ones.

However, the This is my 1st experience with a M2 drive. The drive I am buying is relatively expensive and there is no return policy on it unless it is defective.

I wanted consult here and check if M2 drives are as versatile and compatible as SATA drives?

Is it possible that a laptop has a very specific M2 specification? This is the case for laptop memory. but I am not sure if M2 SSD are universal or not.

Update 1

Here is the lenovo part:

ThinkPad M.2 512GB SATA SSD (4XB0K48501) enter image description here

Here is the part that I am thinking to buy:

http://www.samsung.com/us/computing/memory-storage/solid-state-drives/ssd-850-evo-m2-1tb-mz-n5e1t0bw/

enter image description here

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I wanted consult here and check if M2 drives are as versatile and compatible as SATA drives?

Yes and no.

First of: There is not a single M.2 option. The M.2 port comes in several flavours, some supporting different standards than others. You want to make sure that you get a M.2 SSD with the same options as your socket provides.

Wikipedia has a nice list of M.2 keys. For a SSD you want a M.2 socket and M.2 device with the M-key. These support both PCIe ×4 and classic SATA.

For the drive you also want the M.2 keyed for M, but that still allows two options:

  1. A SSD drive keyed for M with a SATA interface. This has no advantage over a regular SATA SSD drive with the sole exception of a smaller form factor.
  2. A SSD drive keyed for M with a PCI-e/NVME interface. This interface can be much faster. Example: the Samsung 960 EVO with read and write speeds up to 3200 MB/s. Way above SATA-III. The NVME protocol is specifically written to SSD and does not make any assumptions about head movements of low queue depts. This is the currently (2016) preferred interface.


So much about background.

Both drives in your post show "SATA M.2". That means they are using the SATA interface over the M.2 connector. They will act as regular SATA drives. The motherboard may disable another SATA port to reroute this tho the M.2 connector. (Many desktop motherboards do, no idea about your laptop). SATA M.2

[Edit] A quick google on your laptop to search which M.2 sockets it had showed me this article.

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