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FUJITSU MHW2120BS User Manual

Page 211

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5.3 Host Commands

(36) SET MAX (X’F9’)

SET MAX Features Register Values

Value Command

00h Obsolete

01h

SET MAX SET PASSWORD

02h

SET MAX LOCK

03h

SET MAX UNLOCK

04h

SET MAX FREEZE LOCK

05h - FFh

Reserved

SET MAX ADDRESS

A successful READ NATIVE MAX ADDRESS command shall immediately
precede a SET MAX ADDRESS command.

This command allows the maximum address accessible by the user to be set in LBA
or CHS mode. Upon receipt of the command, the device saves the maximum
address specified in the DH, CH, CL and SN field then, reports the status to the host.

The new address information set by this command is reflected in Words 1, 54, 57,
58, 60 and 61 of IDENTIFY DEVICE information. If an attempt is made to
perform a read or write operation for an address beyond the new address space, an
ID Not Found error will result.

When SC field bit 0, VV (Value Volatile), is 1, the value set by this command is
held even after power on. When the VV bit is 0, the value set by this command
becomes invalid when the power is turned on, and the maximum address returns to
the value most lately set when VV bit = 1. (When the command with VV=1 has
not issued before, the maximum address returns to the default value.)

When the READ NATIVE MAX ADDRESS command has been issued
immediately preceding this command, this command operates normally as the SET
MAX ADDRESS command. Otherwise, this command operates as one of the
SET MAX subcommands depending on the value in the Features field. The
subcommands are explained below.

After power on, the host can issue this command only once when VV bit = 1. If this
command with VV bit = 1 is issued twice or more, any command following the first
time will result in an ID Not Found error.

When the SET MAX ADDRESS EXT command is executed, SET MAX
ADDRESS command is aborted. The address value returns to the origin when the
SET MAX ADDRESS EXT command is executed using the address value
returned by the READ NATIVE MAX ADDRESS command.

C141-E249

5-137

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