// ntddcdrm.h

typedef struct _CDROM_SET_SPEED {
  CDROM_SPEED_REQUEST RequestType;
  USHORT              ReadSpeed;
  USHORT              WriteSpeed;
  WRITE_ROTATION      RotationControl;
} CDROM_SET_SPEED, *PCDROM_SET_SPEED;
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Windows Driver Kit DDI reference (ns-ntddcdrm-_cdrom_set_speed)

_CDROM_SET_SPEED structure

Description

The CDROM_SET_SPEED structure is used with the IOCTL_CDROM_SET_SPEED request to set the spindle speed of a CD-ROM drive during data transfers in which no data loss is permitted.

Members

`RequestType`

A CDROM_SPEED_REQUEST-typed value that indicates the type of set speed operation for IOCTL_CDROM_SET_SPEED to perform.

`ReadSpeed`

The read speed, in kilobytes per second.

`WriteSpeed`

The write speed, in kilobytes per second.

`RotationControl`

A WRITE_ROTATION-typed value that indicates whether the drive uses constant angular velocity (CAV) or constant linear velocity (CLV) rotation when it writes to a CD.

CDROM_SET_SPEED - NtDoc