[conspire] Taxonomy of SSD sticks for M.2 sockets
rick at linuxmafia.com
Tue May 25 13:55:21 PDT 2021
----- Forwarded message from Rick Moen <rick at linuxmafia.com> -----
Date: Tue, 25 May 2021 13:53:31 -0700
From: Rick Moen <rick at linuxmafia.com>
To: golugtech at diypython.us
Subject: [Golugtech] 500 GB WDC M.2 2280 _NVMe_ is $64.99 (was: 500 GB
Western Digital M2-2280 is $54.99)
Organization: If you lived here, you'd be $HOME already.
Quoting Alex Finkel (alex.finkel at gmail.com):
> I agree and for not much more money ($70), you can get the an NVMe
> drive with the same capacity:
I note from the picture that this stick has an M.2 edge-connector with
subtype M keying, hence will require a motherboard that has a subtype-M
socket, rather than a subtype-E one. (Again, check compatibility before
This particularly unit shares with the earlier WDC unit reliance on
cheaper, denser-packed, shorter-service-life 3D TLC NAND storage.
On the plus side, unlike the SATA-type stick's 3-year warranty, this one
has a 5-year warranty.
I note the product page's caution that it may be desirable, depending on
application (but mostly for desktop machines), to use the variant with
attached _heatsink_, costing a bit more. Intuition suggests that if
you're not sure, and it's not destined for a well-ventilated server,
shell out $20 more for the version with heatsink.
As a point of clarification: Upthread I spoke of the difference between
SATA-interface SSDs on M.2 and PCIe-interface SSDs on M.2 (making the
point that the latter is much preferable). My understanding is that
NVMe is an advanced _data-transfer_ protocol for PCIe-physical-interface
devices. So, NVMe data addressing _implies_ the PCIe physical bus.
NVMe was concocted in 2011 to replace the very successful but aging
AHCI data-addressing protocol that emerged with early SATA -- revamped
to take advantage of PCIe electrical signaling. More at:
GolugTech mailing list
GolugTech at diypython.us
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