Hitachi IC25N080ATMR04-0 Specifications - Page 93
Protected Area Function
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Table 53: Command table for device lock operation Security Erase Unit Security Freeze Lock o o x x o o Security Set Password x o x Security Unlock Seek o o x o o o Write Long Write Multiple Write Multiple EXT Write Sector(s) Write Sector(s) EXT Write Verify x o o x o o x o o x o o x o o x o o 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: 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 536,870,912 bytes (536MB) 1,048,575 (0FFFFFh) 8,388,608 bytes 16,384 (004000h) 528,482,304 bytes (528MB) 1,032,192 (0FC000h) 0FC000h to 0FFFFFh 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: Travelstar 80GN Hard Disk Drive Specification 83