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NAME
- TD_GETGEOMETRY
-
return the geometry of the drive.
FUNCTION
This command returns a full set of information about the layout of the drive. The information is returned in the DriveGeometry structure pointed to by io_Data.
INPUTS
- io_Device
-
preset by the call to OpenDevice()
- io_Unit
-
preset by the call to OpenDevice()
- io_Command
-
TD_GETGEOMETRY
- io_Flags
-
0 or IOF_QUICK
- io_Data
-
Pointer to a DriveGeometry structure
- io_Length
-
sizeof(struct DriveGeometry)
RESULT
- io_Error
-
0 for success, or an error code as defined in <devices/trackdisk.h>
NOTES
This information may change when a disk in inserted when certain hardware is present.
The information provided with this command may not actually reflect the true device geometry as hard disk geometries are more complex than what can be described by the DriveGeometry structure. However, the size of the medium described by this structure is "approximately correct" in the sense that the sector size is correct (or accepted by the drive), and the number of blocks due to this structure is not larger than the physical block count of the drive.
The information provided with this command may not actually reflect the true device geometry as hard disk geometries are more complex than what can be described by the DriveGeometry structure. However, the size of the medium described by this structure is "approximately correct" in the sense that the sector size is correct (or accepted by the drive), and the number of blocks due to this structure is not larger than the physical block count of the drive.
SEE ALSO
TD_GETDRIVETYPE, TD_GETNUMTRACKS