AT Attachment – 8 ATA/ATAPI Command Set (ATA8-ACS)

IDENTIFY PACKET DEVICE – A1h, PIO Data-in

Some devices may have to read the media in order to complete this command.
Some parameters are defined as a 16-bit value. A word that is defined as a 16-bit value transmits the most
significant byte of the value the first and the least significant byte second (See X943H3.2.7X).
Some parameters are defined as 32-bit values (e.g., words (61:60)). Such values are transferred using two
word transfers. The device shall first transfer the least significant word followed by the most significant value
(See X94H3.2.7X).
Some parameters are defined as a string of ASCII characters (See X945H3.2.7X).

O/M = Mandatory/optional requirement.
M = Support of the word is mandatory.
O = Support of the word is optional.
* = See X949H7.17.7.65X.
F/V = Fixed/variable content.
F = the content of the word is fixed and does not change. For removable media devices, these values may
change when media is removed or changed.
V = the contents of the word is variable and may change depending on the state of the device or the
commands executed by the device.
X = the content of the word may be fixed or variable. (wtf?)

– how to unlock an hard disk with ata master password
– list of ata master passwords

Word	o/m	f/v	Description
53	M	F	15:3 Reserved
		F	2 1 = the fields reported in word 88 are valid
			0 = the fields reported in word 88 are not valid
		F	1 1 = the fields reported in words (70:64) are valid
			0 = the fields reported in words (70:64) are not valid
		X	0 Obsolete
89	O	F	Time required for security erase unit completion
90	O	F	Time required for Enhanced security erase completion
92	O	V	0xFFFE = master password is unchanged
94	O	V	15:8 Vendor’s recommended acoustic management value
		V	7:0 Current automatic acoustic mamagement value.
128	O		Security status
		F	15:9 Reserved
		V	8 0 = Security level High, 1 = Maximum
			1 = Security level Maximum
		F	7:6 Reserved
		F	5 1 = Enhanced security erase supported
		V	4 1 = Security count expired
		V	3 1 = Security frozen
		V	2 1 = Security locked
		V	1 1 = Security enabled
		F	0 1 = Security supported