Is there any difference between HPA and AMAC?

[Fenix]

Hi Unraid-Community,

I have over provisioned a new SSD, it's a Crucial MX500. I followed this guide: SSD Overprovisioning. I already did this with a Samsung EVO 256GB a few years back and I noticed one minor difference.

 

In the guide the over provisioned area is called HPA, whereas when I did it with the new SSD it was called ACCESSIBLE MAX ADDRESS.

 

I couldn't find too much by googling so I proceeded with the tutorial. Everything works as expected, however I'm quite curious what the difference might be. Please let me know if you have heard about this.

 

The message I expected:
root@unraid:~# hdparm -N /dev/sdb
/dev/sdb:
 max sectors   = 312581808/312581808, HPA is disabled

The message I got:
root@unraid:~# hdparm -N /dev/sdb
/dev/sdb:
 max sectors   = 312581808/312581808, ACCESSIBLE MAX ADDRESS is disabled

 

Edited November 17, 2020 by Fenix