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HP HP Pavilion Wave Desktop Host Disassemble
I bought an HP Pavilion Wave over half a year ago, though I haven’t really used it much... Now, looking at the HP online store, it seems that only the highest model is available, while the mid-range and lower configurations have vanished. What’s going on?
The original out-of-the-box setup came with a single-link Sun display. Here’s a picture of it:

It’s been a while since I last used a Lenovo T60, which gave me problems nearly ten years ago. So, I decided to switch to another computer. Although I’ve been using a laptop for quite some time, the screen feels too small for my liking, and since I don’t need to move around the house much, I decided to get a desktop this time. My specific needs are simple: I don’t play games, mostly browsing the web, writing Word documents, Excel sheets, and watching movies. I also have an old desk lakeysky that I like.
Now, here’s my current desktop setup. I’ve been using a spare mouse at home instead of the original wireless one, which was a bit tricky to handle:

By the way, I bought a small bracket to fix the huge power adapter underneath the desk:

At the time, it was a mid-range build with a 1TB mechanical hard drive. Sometimes at night, I could hear the hard drive making noises. Recently, I’ve been feeling the need for an upgrade. I’m thinking of replacing the mechanical hard drive with an SSD and increasing the memory capacity.
I’ve delayed taking apart the machine for a long time. Initially, I didn’t find any tutorials online, but now I’ve managed to find a few articles. Since there are tutorials available, let’s give it a try.
First, turn the host upside down and kick off the three anti-slip mats at the bottom:

Notice the anti-slip stickers near the interface area on the anti-slip mat:

Remove the three screws under the anti-slip mats, and you can open the bottom cover:

Inside, you’ll see the hard drive, fan, motherboard, and the middle part surrounded by speakers:

Now, let’s start the teardown process:
First, unplug the four interface cables connecting the shell and the motherboard—two on the small PCB of the shell and two on the motherboard:

Then, the shell can be removed. While holding the host upside down, gently push the shell upward from the edge of the interface area, and the entire shell will come off slowly. Be careful when removing the shell as several interface cables are attached to it:

Here’s the host without the shell. The red part is the hard drive, the yellow part is the fan, and the blue part is the motherboard:

After removing the shell, you can see the three sides clearly:
On the left side of the fan bracket is the location of the memory slot, which can be accessed by removing a fixing screw from the top of the stand (the red position in the image below) and pushing the small metal plate on the left (the blue position in the image below):

Once opened, it looks like this:

Removing the memory reveals:

There are two slots for memory expansion, allowing for dual-channel memory:

Conclusion 1: Memory expansion is relatively straightforward.
Next, let’s look at the hard drive location. It is fixed with four screws and can be removed:

Unplug the hard drive's data cable, and you can pull the hard drive out from above:

This is a 1TB desktop mechanical hard drive, pretty large:

You can replace this with an SSD, but you may need to add a mounting bracket since the hard drive sizes differ, requiring proper fixation.
Checking online, it seems there’s no way to install two hard drives, such as an SSD and a notebook mechanical hard drive, even though there’s enough space. The motherboard doesn’t appear to have extra interfaces...
Conclusion 2: Replacing the mechanical hard drive with an SSD isn’t overly complicated.
Finally, let’s consider the motherboard location. Online, there seems to be a reserved M.2 interface on the back of the motherboard (likely the blue position in the image below). High-end models come with an SSD installed here. However, adding an M.2 SSD to this location requires removing the motherboard bracket. You’d need to first remove the top shell of the host, take out the speaker, remove the hard drive bracket, and remove everything before you can access the motherboard bracket...

Looking closely, there’s a gap next to the wireless network card, as if it could be directly replaced. Why doesn’t the M.2 interface have an opening?
Conclusion 3: Expanding with M.2 SSDs is challenging...
Now, the fastest option might be cutting a hole directly on the motherboard bracket?
Let me know if you need further details or help!