
6.3.1Identify 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 |
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0 | Configuration information: | 0C5AH | |
| • Bit 15: 0 = ATA; 1 = ATAPI |
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| • Bit 7: removable media |
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| • Bit 6: removable controller |
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| • Bit 0: reserved |
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1 | Number of logical cylinders | 16,383 |
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2 | 0000H | ||
3 | Number of logical heads | 16 |
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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 | x.xx | ||
| (8 ASCII character string, padded with blanks to end of string) |
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|
Drive model number: |
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| |
| (40 ASCII characters, padded with blanks to end of string) |
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47 | (Bits | 8010H | |
| multiple (16) |
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48 | Reserved | 0000H |
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49 | Standard Standby timer, IORDY supported and may be disabled | 2F00H |
|
50 | 0000H |
| |
51 | PIO | 0200H |
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52 | Retired | 0200H |
|
53 | Words | 0007H |
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54 | Number of current logical cylinders | xxxxH |
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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 | xxxxH | |
| or Write Multiple command |
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|
Total number of | 0FFFFFFFh* | ||
| (see Section 2.2 for related information) |
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| *Note: The maximum value allowed in this field is: 0FFFFFFFh |
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| (268,435,455 sectors, 137GB). Drives with capacities over 137GB will |
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| have 0FFFFFFFh in this field and the actual number of |
|
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| able LBAs specified in words |
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| support the |
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62 | Retired | 0000H |
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63 | Multiword DMA active and modes supported | xx07H | |
| (see note following this table) |
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64 | Advanced PIO modes supported (modes 3 and 4 supported) | 0003H |
|
65 | Minimum multiword DMA transfer cycle time per word (120 ns) | 0078H |
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CONSTELLATION ES SERIAL ATA PRODUCT MANUAL, REV. F | 33 |