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

One Response to “AT Attachment – 8 ATA/ATAPI Command Set (ATA8-ACS)”

  1. “AT Attachment – 8 ATA/ATAPI Command Set (ATA8-ACS) I see 0xDEAD disks” was indeed a
    great post. If it included alot more pics it could be
    possibly even a lot better. Thanks -Aurora

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