Host Protected Area Feature - Hitachi HDS721050CLA362 Specifications

Host Protected Area Feature

9.7
Host Protected Area Feature is to provide the 'protected area' which can not be accessed via conventional
method. This 'protected area' is used to contain critical system data such as BIOS or system management
information. The contents of entire system main memory may also be dumped into 'protected area' to resume
after system power off.
The LBA/CYL changed by following command affects the Identify Device Information.
The following set of commands is implemented for this function.
Read Native Max ADDRESS
Set Max ADDRESS
9.7.1 Example for operation (In LBA mode)
Assumptions:
For better understanding, the following example uses actual values for LBA, size, etc. Since it is just an example,
these values could be different.
Device characteristics
Capacity (native)
Max LBA (native)
Required size for protected area
Required blocks for protected area
Customer usable device size
Customer usable sector count
LBA range for protected area
1. Shipping HDDs from HDD manufacturer
When the HDDs are shipped from HDD manufacturer, the device has been tested to have usable capacity
of 6.4GB besides flagged media defects not to be visible by system.
2. Preparing HDDs at system manufacturer
Special utility software is required to define the size of protected area and store the data into it.
The sequence is:
Issue Read Native Max Address command to get the real device maximum LBA. Returned value shows
that native device Maximum LBA is 12,692,735 (C1ACFFh) regardless of the current setting.
Make entire device be accessible including the protected area by setting device Maximum LBA as
12,692,735 (C1ACFFh) via Set Max Address command. The option could be either nonvolatile or
volatile.
Test the sectors for protected area (LBA >=
HITACHI Deskstar & CinemaStar 7K1000.B & Deskstar E7K1000 Hard Disk Drive specification
('F8'h)
('F9'h)
: 6,498,680,832
: 12,692,735
: 206,438,400
:
: 6,292,242,432
: 12,289,536
: BB8600h to C1ACFFh
12,289,536 (BB8600h)) if required.
67
byte (6.4GB)
(0FFFFFh)
byte
403,200 (062700h)
byte (6.2GB)
(BB8600h)