Device Configuration Freeze Lock (Subcommand C1H); Device Configuration Identify (Subcommand C2H); Device Configuration Set (Subcommand C3H) - Hitachi HDS723020BLA642 Specifications

11.3.2

Device Configuration Freeze Lock (Subcommand C1h)

The Device Configuration Freeze Lock command prevents accidental modification of the Device Configuration
Overlay settings. After successful execution of a Device Configuration Freeze Lock command, all Device
Configuration Set, Device Configuration Freeze Lock, Device Configuration Identify, and Device Configuration
Restore commands are aborted by the device. The Device Configuration Freeze Lock condition shall be cleared
by a power-down. The Device Configuration Freeze Lock condition shall not be cleared by hardware or software
reset.
11.3.3

Device Configuration Identify (Subcommand C2h)

The Device Configuration Identify command returns a 512 byte data structure via PIO data-in transfer. The
content of this data structure indicates the selectable commands, modes, and feature sets that the device is
capable of supporting. If a Device Configuration Set command has been issued reducing the capabilities, the
response to an Identify Device or Identify Packet Device command will reflect the reduced set of capabilities,
while the Device Configuration Identify command will reflect the entire set of selectable capabilities.
The format of the Device Configuration Overlay Data structure is shown on next page.
11.3.4

Device Configuration Set (Subcommand C3h)

The Device Configuration Set command allows a device manufacturer or a personal computer system
manufacturer to reduce the set of optional commands, modes, or feature sets supported by a device as
indicated by a Device Configuration Identify command. The Device Configuration Set command transfers an
overlay that modifies some of the bits set in words 63, 82, 83, 84, and 88 of the Identify Device command
response. When the bits in these words are cleared, the device no longer supports the indicated command,
mode, or feature set. If a bit is set in the overlay transmitted by the device that is not set in the overlay received
from a Device Configuration Identify command, no action is taken for that bit.
The format of the overlay transmitted by the device is described in the table on next page. The restrictions on
changing these bits are described in the text following that table. If any of the bit modification restrictions
described are violated or any setting is changed with Device Configuration Set command, the device shall return
command aborted. At that case, error reason code is returned to sector count register, invalid word location is
returned to cylinder high register, and invalid bit location is returned to cylinder low register. The Definition of
error information is shown on page 117.
Error Information Example 1:
After establish a protected area with Set Max address, if a user attempts to change maximum LBA address
(Device Configuration Set or Device Configuration Restore), device shall abort that command and return error
reason code as below.
Cylinder high
Cylinder low
Sector Number
Sector count
Error Information Example 2:
When device is enabled the Security feature set, if user attempts to disable that feature, device abort that
command and return error reason code as below.
Cylinder high
Cylinder low
Sector Number
Sector count
: 03h = word 3 is invalid
: 00h this register is not assigned in this case
: 00h this register is not assigned in this case
: 06h = Protected area is now established
: 07h = word 7 is invalid
: 00h = bit 8-15 are valid
: 08h = bit 3 is invalid
: 04h = now Security feature set is enabled
Hitachi hard disk drive specifications
115