![](/images/new-backgrounds/1110979/11097973x1.webp)
4.3.1Identify 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
The following commands contain
Word | Description | Value |
|
|
|
| Configuration information: | 0C5AH |
| • Bit 15: 0 = ATA; 1 = ATAPI |
|
0 | • Bit 7: removable media |
|
| • Bit 6: removable controller |
|
| • Bit 0: reserved |
|
|
|
|
1 | Number of logical cylinders | 16,383 |
|
|
|
2 | 0000H | |
3 | Number of logical heads | 16 |
|
|
|
4 | Retired | 0000H |
5 | Retired | 0000H |
6 | Number of logical sectors per logical track: 63 | 003FH |
Retired | 0000H | |
Serial number: (20 ASCII characters, 0000H = none) | ASCII | |
20 | Retired | 0000H |
21 | Retired | 0400H |
22 | Obsolete | 0000H |
Firmware revision (8 ASCII character string, padded with blanks to end of | x.xx | |
| string) |
|
|
|
|
Drive model number: (40 ASCII characters, padded with blanks to end of |
| |
| string) |
|
|
|
|
47 | (Bits | 8010H |
| multiple (16) |
|
|
|
|
48 | Reserved | 0000H |
49 | Standard Standby timer, IORDY supported and may be disabled | 2F00H |
50 | 0000H | |
51 | PIO | 0200H |
52 | Retired | 0200H |
53 | Words | 0007H |
54 | Number of current logical cylinders | xxxxH |
55 | Number of current logical heads | xxxxH |
56 | Number of current logical sectors per logical track | xxxxH |
Current capacity in sectors | xxxxH | |
59 | Number of sectors transferred during a Read Multiple or Write Multiple | xxxxH |
| command |
|
|
|
|
DiamondMax 20 Serial ATA Product Manual, Rev. A | 29 |