MBR signature invalid

[WinExperements]

So i am trying to read the MBR partition table from hard drive via ATA PIO, and my mbr structure goes wrong(always zero).
Maybe i am incorrectly reading it? Or something else?

Here the output of readed data and the mbr structure signature

[Octocontrabass]

That looks like half of a normal Windows MBR. Where's the other half?

[WinExperements]

Where's the other half?

Okay I am read 256 words as sector, if I set it to 512 nothing changes, so what I am doing wrong with reading?

[Octocontrabass]

You're reading 256 words, but you're displaying 256 bytes. You lost half of each word somewhere.