about reducing HDD capacity

[Core.iStores]

can anyone tell me that does MRT Ultra support reducing HDD capacity ? like if i had 1T can i cut a space and make it 900M for good ?

thanks in advance

[northwind]

Why you need MRT for that?
Simple HPA won't do what you want?

[fzabkar]

HDAT2 and hdparm can create a HPA.

[Core.iStores]

Why you need MRT for that?
Simple HPA won't do what you want?

cause i have it and i want to reduce the capacity for good. So does MRT support reducing ?