Seagate ST400FM0002 Pulsar Serial ATA Product Manual - Page 33
Identify Device command
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4.3.1 Identify Device command The Identify Device command (command code ECH) transfers information about the drive to the host following power up. The data is organized as a single 512-byte block of data, whose contents are shown in Table 7 on page 25. All reserved bits or words should be set to zero. Parameters listed with an "x" are drive-specific or vary with the state of the drive. See Section 2.0 on page 3 for default parameter settings. The following commands contain drive-specific features that may not be included in the Serial ATA specification. Word 0 1 2 3 4-5 6 7-8 9 10-19 20-21 22 23-26 27-46 47 48 49 50 51 52 53 54 55 56 57-58 59 60-61 62 63 Description General configuration Number of logical cylinders (obsolete) 16,383 Specific configuration Number of logical heads (obsolete) 16 Retired Number of logical sectors per logical track (obsolete) 63 Reserved for CompactFlash Association Retired Serial number: (ATA ASCII string padded with spaces (20H)) Retired Obsolete Firmware revision (ATA ASCII string padded with spaces (20h)) Model number (ATA ASCII string padded with spaces (20h)) (Bits 7-0) Maximum number of logical sectors that shall be transferred per DRQ data block on READ/WRITE MULTIPLE commands. 16 Reserved for Trusted Computing feature set options Capabilities - Standby Timer, IORDY Support, etc Capabilities Continued PIO data transfer cycle timing option (Obsolete) Retired Words 54-58, 64-70 and 88 are valid Number of current logical cylinders (Obsolete) Number of current logical heads (Obsolete) Number of current logical sectors per logical track (Obsolete) Current capacity in sectors (Obsolete) Number of LBAs transferred per Read Multiple or Write Multiple. Sanitize Command Support Total number of user addressable logical sectors for 28-bit commands Note: The maximum value allowed in this field is: 0FFFFFFFh. If this field contains 0FFFFFFFh and the device has user addressable LBAs greater than or 137GB, then words 100..103 contain the total number of user addressable LBAs Obsolete Multiword DMA active and modes supported (see note following this table) Value 0040H 3FFFH C837H 0010H 0000H 003FH 0000H 0000H ASCII 0000H 0004H ASCII ASCII 8010H 0000H 2F00H 4000H 0200H 0200H 0007H 3FFFH 0010H 003FH FC10H 00FBH 0101H XXXXXXXXH* 0000H 0007H Pulsar Product Manual, Rev. A 27