Hitachi IC25N020ATMR04, Технические характеристики

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Travelstar 80GN Hard Disk Drive Specification
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11.10 Protected Area Function
Protected Area Function provides a protected area which cannot be accessed via conventional methods. This
protected area is used to contain critical system data such as BIOS or system management information. The contents
of the entire system main memory may also be dumped into the protected area to resume after a system power off.
The LBA/CYL changed by the following commands affects the Identify Device Information.
Two commands are defined for this function:
• Read Native Max ADDRESS ('F8'h)
• Set Max ADDRESS ('F9'h)
Four security extension commands are implemented as sub functions of the Set Max ADDRESS:
• Set Max SET PASSWORD
• Set Max LOCK
• Set Max FREEZE LOCK
• Set Max UNLOCK
11.10.1 Example for operation (In LBA Mode)
The following example uses hypothetical values.
Device characteristics:
1. Shipping drives from the drive manufacturer
When the drive is shipped from the manufacturer, the device has been tested to have a capacity of 536MB,
flagging the media defects not visible by the system.
2. Preparing drives at system manufacturer
Special utility software is required to define the size of the protected area and to store the data in it. The
sequence is:
Security Erase Unit
o o x
Write Long
x o o
Security Freeze Lock
x o o
Write Multiple
x o o
Write Multiple EXT
x o o
Security Set Password
x o x
Write Sector(s)
x o o
Write Sector(s) EXT
x o o
Security Unlock
o o x
Write Verify
x o o
Seek
o o o
Capacity (native) 536,870,912 bytes (536MB)
Max LBA (native) 1,048,575 (0FFFFFh)
Required size for protected area 8,388,608 bytes
Required blocks for protected area 16,384 (004000h)
Customer usable device size 528,482,304 bytes (528MB)
Customer usable sector count 1,032,192 (0FC000h)
LBA range for protected area 0FC000h to 0FFFFFh
Table 53: Command table for device lock operation