EE25.2 Series Product Manual, Rev. B

37

4.4 Identify Device comm and

The Identify Device command (command code ECH) transfers information about the drive to the host following

power up. The data, shown below, is organized as a single 512-byte block of data. 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 tha t may n ot be i n cluded in t he ATA-6 Stand ard.

Word Description Value
0 Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
0C5AH
1 Number of logical cylinders 16,383
2 ATA-reserved 0000H
3 Number of logical heads 16
4 Retired 0000H
5 Retired 0000H
6 Number 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) ST980817AM
ST980818AM
ST980817SM
ST980818SM
ST960817AM
ST960818AM
ST960817SM
ST960818SM
ST940817AM
ST940818AM
ST940817SM
ST940818SM
ST930817AM
ST930818AM
ST930817SM
ST930818SM
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
51 PIO data-transfer cycle timing mode 0200H
52 Retired 0200H