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Max Address command should be set in HD, SN register. Otherwise, the value shall be ignored and the value of
Read Max Address command will be used. If an LBA bit (DRV / HD register bit 6) is set, the value in LBA mode
shall be set. If the address exceeding the set value is accessed , ABORT ERROR error will be reported. This
set value affects the values of WORD 1, 54, 57, 58, 60, 61 of IDENTIFY DEVICE command.
This command shall be immediately preceded by Read Native Max Address command. Otherwise, it will be
terminated with ABORT ERROR .
If this command is issued twice with a volatile bit set to 1 after power-up or hardware reset, ID Not Found
error will be reported.
Volatile bit ( SC register bit 0 ) :
If this command is issued with a volatile bit set to 1, the set value of this command is valid after power-up or
hardware reset.
If this command is issued with a volatile bit cleared to 0, the set value of this command shall be cleared after
hard reset or power-on and the maximam value shall be the last value with a volatile bit set to 1.
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10.8.24.2 Set Max Set Password
F9h with the content of the Features register equal to 01h.
1 1 1 1 1 0 0 1
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC no change
FT 01 H no change
LBA no change
This command is not immediately preceded by a READ NATIVE MAX ADDRESS command. If this command is
immediately preceded by a READ NATIVE MAX ADDRESS command, it shall be interpreted as a SET MAX
ADDRESS command.
This command requests a transfer of a single sector of data from the host. Table 10.8-6 defines the content of this
sector of information. The password is retained by the device until the next power cycle. When the device
accepts this command the device is in Set_Max_Unlocked state.
Table 10.8-6 SET MAX SET PASSWORD data content
Word Content
0 Reserved
1-16 Password (32 bytes)
17-255 Reserved
10.8.24.3 Set Max Lock
F9h with the content of the Features register equal to 02h.
1 1 1 1 1 0 0 1
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC no change
FT 02 H no change
LBA no change
This command is not immediately preceded by a READ NATIVE MAX ADDRESS command. If this command is
immediately preceded by a READ NATIVE MAX ADDRESS command, it shall be interpreted as a SET MAX
ADDRESS command.
The SET MAX LOCK command sets the device into Set_Max_Locked state. After this command is completed
any other SET MAX commands except SET MAX UNLOCK and SET MAX FREEZE LOCK are rejected. The
device remains in this state until a power cycle or the acceptance of a SET MAX UNLOCK or SET MAX FREEZE
LOCK command.
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10.8.24.4 Set Max Unlock
F9h with the content of the Features register equal to 03h.
1 1 1 1 1 0 0 1
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC no change
FT 03 H no change
LBA no change
This command is not immediately preceded by a READ NATIVE MAX ADDRESS command. If this command is
immediately preceded by a READ NATIVE MAX ADDRESS command, it shall be interpreted as a SET MAX
ADDRESS command.
This command requests a transfer of a single sector of data from the host.Table 10.8-5 defines the content of this
sector of information.
The password supplied in the sector of data transferred shall be compared with the stored SET MAX password.
If the password compare fails, then the device returns command aborted and decrements the unlock counter. On
the acceptance of the SET MAX LOCK command, this counter is set to a value of five and shall be decremented
for each password mismatch when SET MAX UNLOCK is issued and the device is locked. When this counter
reaches zero, then the SET MAX UNLOCK command shall return command aborted until a power cycle.
If the password compare matches, then the device shall make a transition to the Set_Max_Unlocked state and all
SET MAX commands shall be accepted.
10.8.24.5 Set Max Freeze Lock
F9h with the content of the Features register equal to 04h
1 1 1 1 1 0 0 1
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC no change
FT 04 H no change
LBA no change
A SET MAX SET PASSWORD command shall previously have been successfully completed. This command is
not immediately preceded by a READ NATIVE MAX ADDRESS command. If this command is immediately
preceded by a READ NATIVE MAX ADDRESS command, it is interpreted as a SET MAX ADDRESS command.
The SET MAX FREEZE LOCK command sets the device to Set_Max_Frozen state. After command completion
any subsequent SET MAX commands are rejected.
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Commands disabled by SET MAX FREEZE LOCK are:
- SET MAX ADDRESS
- SET MAX SET PASSWORD
- SET MAX LOCK
- SET MAX UNLOCK
10.8.25 Read Native Max Address (F8h)
1 1 1 1 1 0 0 0
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY maximum cylinder number
HD maximum head number
SN maximum sector number
LBA maximum LBA
This command sets the maximum address in CY, HD, SN register. If LBA ( DRV / HD register bit6 ) is set to
1, the maximum address shall be LBA value.
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10.8.26 Set Features (EFh)
1 1 1 0 1 1 1 1
COMMAND CODE REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC Mode Selection for Data Transfer(*2) no change
FT Features(*1) no change
(*1) Features: FT register defines following selections.
02H Enable write cache feature
03H Select data transfer mode
05H Enable advanced power management
44H ECC length is 46 bytes during Read/Write Long command
55H Disable read look-ahead feature
66H Disable reverting to power on defaults by soft reset
82H Disable write cache feature
85H Disable advanced power management
AAH Enable read look-ahead feature
BBH ECC length is 4 bytes during Read/Write Long command
CCH Enable reverting to power on defaults by soft reset
others Invalid (reporting with Aborted Command Error)
(*2)Mode selection for data transfer is specified in sector count register. Upper 5 bits show transfer mode
and lower 3 bits show mode figure.
PIO default transfer mode 00000 000
PIO default transfer mode, disable IORDY 00000 001
PIO flow control transfer mode nnn 00001 nnn
Single word DMA mode nnn 00010 nnn
Multiword DMA mode nnn 00100 nnn
Ultra DMA mode nnn 01000 nnn
Reserved 10000 nnn
PIO default mode is mode 4 flow control. DMA default mode is Multiword DMA mode 2.
The level of Advanced Power Management function is set in Sector count register.
C0h-FEh & & Mode0 (Power save up to Low Power Idle)
80h-BFh & & Mode1 (Power save up to Low Power Idle)
01h-7Fh & & Mode2 (Power save up to Standby)
00h,FFh & & Aborted
Transition time of power save is changed dynamically in Mode1 and Mode2 due to Adaptive power control
function. The function level is set to Mode1 when Advanced Power Management function is disabled.
If FT register has any other value, the drive rejects the command with Abort Command error.
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