// ntddcdrm.h

typedef struct _CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR {
  UCHAR StartLba[4];
  UCHAR StartPerformance[4];
  UCHAR EndLba[4];
  UCHAR EndPerformance[4];
} CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR, *PCDROM_NOMINAL_PERFORMANCE_DESCRIPTOR;
View the official Windows Driver Kit DDI reference

NtDoc

No description available.

Edit description on GitHub

Windows Driver Kit DDI reference (ns-ntddcdrm-_cdrom_nominal_performance_descriptor)

_CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR structure

Description

The CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR structure gives the host an approximation of logical unit performance. It is returned by the IOCTL_CDROM_GET_PERFORMANCE I/O control request when the request type is CdromPerformanceRequest and the Except field of the CDROM_PERFORMANCE_HEADER is false (0). Separate descriptors are returned for read and write performance requests. The fields in CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR correspond to the similarly named fields in the "Performance Descriptor - Nominal Performance" table described in the MultiMedia Command Set - 6 (MMC-6) specification.

Members

`StartLba`

The StartLba field (Start LBA) contains the first logical block address of the extent described by this descriptor.

`StartPerformance`

The StartPerformance field (Start Performance) contains the nominal logical unit performance at the Start LBA in kilobytes per second.

`EndLba`

The EndLba field (End LBA) contains the last logical block address of the extent described by this descriptor.

`EndPerformance`

The EndPerformance field (End Performance) contains the nominal logical unit performance at the End LBA in kilobytes per second.

CDROM_NOMINAL_PERFORMANCE_DESCRIPTOR - NtDoc