My problem is: I have a laptop with a single 2.5" SATA slot, and I want to have a fast interactive workflow (needs an SSD) and processing and storing of large media files (at least 1 TB, an SSD is too expensive, a HDD is good). An SSHD in the single SATA slot would work, but I don't trust the smartness how the SSHD firmware decides which blocks to keep on SSD (thus the SSHD can be slower than an SSD), and I also don't trust the failure mode (if the SSD or the HDD within the SSHD breaks, will I lose access to the blocks on the other device as well? probably I'll lose everything).
So I'm looking for a 2.5" SSHD for which I can access the SSD and the HDD separately on Linux, either as separate SATA devices, or as a single SATA device whose beginning (first few gigabytes) is mapped to the SSD, and the end (remaining gigabytes) is mapped to the HDD. Does such a product exist on the market? (I wasn't able to find one.) Is there a name for such products which I can use to search for them?
(Please note that I'm not looking for comparisons or recommendations.)
I'm not able to use separate SSD and HDD devices, because my laptop has only a single 2.5" SATA slot, and using external USB storage is not feasible in my use case.
Please note that I'm not interested in typical SSHD products, where the SSHD firmware decides (and hides) which data block goes to SSD and which data block goes to HDD.
I think a typical SSHD with a proper firmware upgrade could work (especially if the device presents itself as a single SATA device). Does such a device with such a firmware exist?
I know about the following alternatives:
Buying a very large (multi-terabyte) SSD.
Buying a new laptop which can fit both an HDD and an SSD.
Replacing the DVD reader in the laptop with an HDD.
Booting the laptop from a fast USB device (probably SSD) or memory card, and having a SATA HDD within the laptop.
Loading the entire operating system to RAM from HDD at boot time, and then running from RAM, and using the HDD for accessing media files only.
However, and SSHD with separate access to SSD and HDD would be better for me than the alternatives, because it's cheaper, simpler, doesn't need extra RAM, and doesn't need external devices to be connected.
I understand that data loss is more likely with a custom, unofficial, untested SSHD firmware than with the stock firmware.