Why is my hybrid hard drive slower than an HDD?

I did 3 benchmarks today. First with my Seagate FireCuda 2TB 2.5 inch (ST2000LX001, SSHD), then with my Seagate BarraCuda (ST2000LM015, HDD) and with an SSD that I still had lying around.

These are the CrystalDiskMark 7 values: https://drive.google.com/...sp=sharing

The SSHD is in my notebook via SATA. I connected the rest with an external housing via USB 3.0. However, the SSHD is so slow that it is the slowest.

Is there something wrong? Or is everything okay? If not, how can I fix it?

In terms of speed, USB 3.0, like USB 2.0, is based on the weakest link in the chain. A USB 3.0 device is therefore transferred to a USB 2.0 controller with a maximum of 480 Mbit / s (high-speed mode for USB 2.0). To achieve the full 5 GBit / s (super-speed mode), you need a USB 3.0 controller or connection.

USB 3.0 is much faster.

But that somehow doesn't fit the question, because here the internal SATA disk is the slowest. Those connected via USB are faster.

Well, as far as I know (I have an sshd myself), it only saves the data like an hdd, and only after it has been moved up and down a few times does it save data that you often need (e.g. The OS or frequently used documents) in flash memory. Then it should actually run faster. If this logic were to be followed, the benchmark would have to be run several times so that the data ends up in the flash memory.

I did another benchmark with more runs that showed far better results.