zfs discuss - Jul 2011 - Adjusting HPA from Solaris on Intel 320 SSD''s

Is there a way to tweak the HPA (Host Protected Area) on an Intel 320
SSD using native Solaris commands?

In this case, we''d like to shrink the usable space so as to improve
performance per recommendation in "Intel Solid-State Drive 320 Series
in Server Storage Applications" section 4.1.

hdparm on Linux is referenced, and it may be doable via the Intel Solid
State Drive Toolbox, but would be great to be able to tweak and query
this from Solaris / OpenSolaris / NexentaStor.

Did come across this[1] thread from 2007, but it''s not clear if
''format'' or some other utility gained this functionality
since.

Thanks,
Ray