Windows install can't find my NVMe SSD drive on a fresh install

[MicheA]

I have searched but all the answers I have found involve an operating copy of windows. Is there any instructions or advice to get this laptop running on either the old drive or the new drive?

I have installed a new hard drive (WD_BLACK SN750 SE NVMe M.2 PCI-E 4.0 SSD, 1TB) on my laptop (HP Envy x360 15-cp0008ca) leaving the old hard drive installed. I downloaded the windows install media and booted it from USB. When I get to the "where do you want to install windows" window I have the following...

Name - total size - free space - type

Drive 0 Partition 1 - 260.0 MB - 260.0 MB - Primary 

Drive 0 Partition 2 - 16.0 MB - 16.0 MB- MSR (Reser 

Drive 0 Partition 3 - 915.3 GB - 808.5 GB - Primary.

Drive 0 Partition 4 - 980 MB - 963.0 MB - Primary.

Drive 0 Partition 5 - 15.0 GB - 1.8 GB - OEM

I have realized it's not seeing the new drive and took out the old drive (after it failed diagnostics).  Now that screen is blank.  There are no drives to install windows to. 

I guess I have a couple of questions.  I have looked at the maintenance and service guide ( http://h10032.www1.hp.com/ctg/Manual/c06001791.pdf ) and it says the following. 

(10)  Solid-state drive:
256-GB, M.2 2280, PCIe3×4, NVMe, SS solid-state drive with TLC   -   L19452-001
256-GB, 2280, PCIe, NVMe solid-state drive with TLC  -  L25974-001
128-GB, M.2 2280, SATA-3 solid-state drive with TLC  -  L25973-001

1. Does that mean it only supports up to 256-GB SSD? 

2. I have read in a couple of places that some of the boards don't support new generations of the SSD. The one I bought is a 4th gen. Is this true?

3. How do I get the **bleep** thing to work?

[PeteC22]

I hope someone else jumps in, I think I might have the answer to this but as I've only swapped laptop drives rather than installing a new drive while keeping the old one, take this with a grain of salt:

First, no problem running a gen 4 NVMe in a PCIE 3 slot, just keep in mind that you will not get gen 4 performance, it will be restricted to what a gen 3 can max out at, about 3500 gps.

Second, keep in mind that a new NVMe drive needs to be initialized and a simple partition created - if you have not done so, your WD does not yet have a partition on it to be recognized.  

Rather than booting up via usb, I would keep the original hard drive as the boot drive, go into Windows, Computer Management, storage, then open Disk Management.  You can then initialize the WD and create a simple partition.

At this point, you now can either install a fresh Windows installation on the WD or clone your original hard drive to the new one.  From what I understand, if you want to use both drives and boot from the new drive, either reformat the original drive or at least remove it while resetting your BIOS to boot from the new drive.  You may have issues with 2 drives both set as Windows boot drives.