How I solved my "2100: Detection error on HDD0", issue

[edivad]

Hi all.
I hade a very boring problem with my T440,
sometime just randomly was impossible to boot from he Hard Disk "2100: Detection error on HDD0 (Main HDD)".

I have read many post of people that have the same problem here, in x40 and x50 series, I have tried the last bios and hd firmware to solve the issue, bit nothing.
My disk is the original Samsung MZ7TD256HAFV-000L9.

So , in my case it was a sata connector problem, I noticed that when I open the bottom cover the notebook start to booting normally, now I removed the thin sponge on the bottom cover, in this way I gain some space on the top of the hd, now the notebook is booting normally.

This is just my experience, before to modify your bottom cover, try to remove it and press with your hand the hd to simulate the cover closed, and see what append.
Sorry for my English.
Davide