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5.3 Host Commands
C141-E262 5-137
(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(100 to 103) 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.