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Hardware Documentation
> Device Managers and Drivers
> ATA Devices
> ATA Device Software Guide
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The ATA_Identify function returns the device identification data from the selected device. The identification data contains information necessary to perform I/O to the device. Refer to the ATA-2 Specification for the format and the information description provided by the data.
The manager function code for the ATA_Identify function is $13.
The parameter block associated with this function is defined below:
typedef
struct
{
ataPBHdr
/* ataPBHdr parameter block */
SInt8
ataStatusReg;
/* <-- Last ATA status image */
sInt8
ataErrorReg;
/* <-- Last ATA error image */
SInt16
ataReserved;
/* Reserved */
UInt32
BlindTxSize;
/* <-- Set to 512 on return */
UInt8
*DataBuf;
/* <--> Buffer for the data */
UInt32
ataRequestCount;
/* <-- Indicates remaining
byte count */
UInt32
ataActualTxCnt;
/* <-- Actual transfer count */
UInt32
ataReserved2;
/* Reserved */
device
PBRegBlock;
/* <-- taskfile image sent */
/* for the command */
UInt16
Reserved3[8];
/* Reserved */
} ataIdentify;
Field descriptions
-
ataPBHdr
-
See the definition of the
ataPBHdr
parameter block.
-
ataStatusReg
-
Last ATA taskfile status register image.
-
ataErrorReg
-
Last ATA taskfile error register image. This field is only valid if the LSB (error bit) of the
ataStatusReg
field is set .
-
BlindTxSize
-
Size in bytes of the device identify data returned.
-
DataBuf
-
A pointer to the data buffer for the device identify data. The length of the buffer must be at least 512 bytes.
-
ataRequestCount
-
Number of remaining bytes to transfer.
-
ataActualTxCnt
-
Number of bytes transferred.
-
RegBlock
-
Taskfile image sent to the device.
RESULT CODES
See
Table A-1
for possible result codes returned by the ATA Manager.
© 1999 Apple Computer, Inc. — (Last Updated 30 Oct 97) Previous | Back Up One Level | Next | Show Frames | Hide Frames