26
Momentus 4200.2 Product Manual, Rev. C
4.1.2 Identify Device commandThe 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 24. 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 Draf t AT A-6 St andard.
Security Freeze Lock F5H
Security Disable Password F6H
Word Description Valu e
0Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
0C5AH
1Number of logical cylinders 16,383
2ATA-reserved 0000H
3Number of logical heads 16
4Retired 0000H
5Retired 0000H
6Number of logical sectors per logical track: 63 003FH
7–9 Retired 0000H
10–19 Serial number: (20 ASCII characters, 0000H = none) ASCII
20 Retired 0000H
21 Retired 0400H
22 Obsolete 0000H
23–26 Firmware revision
(8 ASCII character string, padded with blanks to end of string) x.xx
27–46 Drive model number: (40 ASCII characters, padded with
blanks to end of string) ST9120824A
ST9100825A
ST980829A
ST960812A
ST950814A
ST9402112A
ST930218A
47 (Bits 7–0) Maximum sectors per interrupt on Read multiple
and Write multiple (16) 8010H
48 Reserved 0000H
49 Standard Standby timer, IORDY supported and may be
disabled 2F00H
50 ATA-reserved 0000H
Table 7: Supported commands
Command name Command code (in hex)