HGST HCS5C3232SLA380 User Manual
HITACHI CinemaStar 5K 320 Hard Disk Drive specification (Rev 1.21)
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9.7 Host Protected Area Feature
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.
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
('F8'h)
Set Max ADDRESS
('F9'h)
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.
these values could be different.
Device characteristics
Capacity (native)
:
6,498,680,832
byte (6.4GB)
Max LBA (native)
:
12,692,735
(0FFFFFh)
Required size for protected area
:
206,438,400
byte
Required blocks for protected area
:
403,200
(062700h)
Customer usable device size
:
6,292,242,432
byte (6.2GB)
Customer usable sector count
:
12,289,536
(BB8600h)
LBA range for protected area
:
BB8600h to C1ACFFh
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.
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:
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.
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.
12,692,735 (C1ACFFh) via Set Max Address command. The option could be either nonvolatile or
volatile.
Test the sectors for protected area (LBA >= 12,289,536 (BB8600h)) if required.