To send the SET CD SPEED command to a CD-ROM device, the caller specifies a request type of CdromSetSpeed in the RequestType member of CDROM_SET_SPEED, on input to IOCTL_CDROM_SET_SPEED. In Windows Vista, applications can instruct the CD-ROM class driver to issue one of these two commands by sending an IOCTL_CDROM_SET_SPEED request to the class driver. Version 2 of the SCSI-3 Multimedia Commands (MMC) specification defines two commands for setting the CD-ROM speed: SET CD SPEED and SET STREAMING. CD-ROM drives that spin at, for example, 16X during playback, when a speed of only 1X is required, can produce loud noise that leads to a bad user experience. For example, CD-ROM drives in media-center computers primarily perform operations, such as audio playback, that do not require speeds above 1X. Some computers do not require CD-ROM drives to operate at high speeds. You can set the CD-ROM drive to a low speed to conserve battery power. For example, in portable computers, CD-ROM drives that spin at high speed drain the battery very quickly. It is often convenient to spin CDs at a speed that is less than the optimal spindle speed that the CD-ROM drive allows.
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