This structure is used in the following IOCTL fns:
440dH 42H (format track on logical drive)
440dH 62H (verify track on logical drive)

DvRq 13H  (generic IOCTL for block devices)

IoctlFmtVrfyTrackRec
Offset Size Contents
                                                                          
+0     1  rSpclFns     must be 0
+1     2  wHead        head to read/write
+3     2  wTrack       track (cylinder) to read/write
5               size of an IoctlFmtVrfyTrackRec

Notes: DOS device drivers do not keep a track layout table for each
logical device.  Before formatting a track, use a generic IOCTL
Set Parameters (440dH 40H) call to set the interleave etc. for
the media in the drive.

See Also: fn 440dH (Generic IOCTL for block devices)
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IoctlFmtVrfyTrackRec