Minix1.5/include/minix/diskparm.h

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/* PC (and AT) BIOS structure to hold disk parameters.  Under Minix, it is
 * used mainly for formatting.
 */

struct disk_parameter_s {
  char spec1;
  char spec2;
  char motor_turnoff_sec;
  char sector_size_code;
  char sectors_per_cylinder;
  char gap_length;
  char dtl;
  char gap_length_for_format;
  char fill_byte_for_format;
  char head_settle_msec;
  char motor_start_eigth_sec;
};