max SSD M.2 size for the HP Probook 650 G1

[Satinstaller]

Hi, what is the largest M.2 SSD that the HP Probook 650 G1 can support.  I assume this thread is correci in saying it has to be a SATA m.2 and not NVMe https://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/SSD-M-2-for-the-HP-Probook-650...

[Huffer · Accepted solution]

Here's the Service Manual:

Manual 

Notebook dates to the dawn of the SSD era about 10 years ago. Definitely only can do SATA interface and the SSD is called a "mini-card" which is not a term we use any more. See page 47 and 72. It is a 2242 form factor sometimes called mSATA mSSD.   It lists SSDs as big (capacity) as 512 gig which at that time would have been wildly expensive. The primary use of these is as an "accelerator cache" using Intel Rapid Storage. However, if there is no regular SATA hard drive or 2.5 inch SSD these mSATA mSSDs can be the primary boot drive. There is no practical hardware capacity limit but you are limited to what can be found in the market. This seller on German eBay has them up to 2 TB for 120 Euro which is a pretty good deal. 

Fanxiang mSATA SSD 2TB 1TB 256GB SSD TLC Interne Festplatten Solid State Drives | eBay

Post back if you need more help. The era where these were used was very short and setting one up is a bit of a forgotten art so you may need some assistance. You will see I answered that prior 2019 thread you link and reviewing it now I am not sure I was accurate then suggesting a 2280 form factor SATA M.2 SSD would work.