Host Protected Area Function; Example For Operation (In Lba Mode); Figure 73. Command Table For Device Lock Operation (2 Of 2) - IBM IC35L020 - Deskstar 20 GB Hard Drive Specifications

Command
Standby
Standby Immediate
Write Buffer
Write DMA (w/o retry)
Write DMA (w/retry)
Write DMA Queued
Write Long (w/o retry)
Write Long (w/retry)
Write Multiple
Write Sector(s) (w/o retry)
Write Sector(s) (w/retry)
Write Verify

Figure 73. Command table for device lock operation (2 of 2)

13.9 Host Protected Area Function

The Host Protected Area Function provides a "protected area" which cannot be accessed using
conventional methods. This "protected area" is used to contain critical system data such as BIOS or
system management information. The contents of the main memory of the entire system may also be
dumped into the "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 are implemented for this function.
Read Native Max Address
Set Max Address

13.9.1 Example for operation (in LBA mode)

Assumptions: For better understanding the following example uses actual values such as LBA and size.
Since it is just an example, the values may be different.
Device characteristics
Capacity (native)
Maximum 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 of drives from the manufacturer
Prior to being shipped from the manufacturer each drive has been tested to have a usable capacity of
6.4 GB besides flagged media defects not visible by system.
2. Preparation of drives by the system manufacturer
Special utility software is required to define the size of the protected area and to store the data into it. The
sequence is as follows:
Locked Mode
Executable
Executable
Executable
Command aborted
Command aborted
Command aborted
Command aborted
Command aborted
Command aborted
Command aborted
Command aborted
Command aborted
('F8'h)
('F9'h)
6,498,680,832 byte (6.4GB)
12,692,735 (C1ACFFh)
206,438,400 byte
403,200 (062700h)
6,292,242,432 byte (6.2GB)
12,289,536 (BB8600h)
BB8600h to C1ACFFh
Deskstar 60 GXP Hard disk drive specification
88
Unlocked Mode Frozen Mode
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable
Executable Executable