// winioctl.h

typedef struct _FSCTL_QUERY_STORAGE_CLASSES_OUTPUT {
  DWORD             Version;
  DWORD             Size;
  DWORD             Flags;
  DWORD             TotalNumberOfTiers;
  DWORD             NumberOfTiersReturned;
  FILE_STORAGE_TIER Tiers[ANYSIZE_ARRAY];
} FSCTL_QUERY_STORAGE_CLASSES_OUTPUT, *PFSCTL_QUERY_STORAGE_CLASSES_OUTPUT;
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Win32 API reference (ns-winioctl-fsctl_query_storage_classes_output)

FSCTL_QUERY_STORAGE_CLASSES_OUTPUT structure

Description

Contains information for all tiers of a specific volume.

Members

`Version`

The size of this structure serves as the version. Set it to sizeof(FSCTL_QUERY_STORAGE_CLASSES_OUTPUT).

`Size`

Size of this structure plus all the variable sized fields.

`Flags`

The element status. This member can be one or more of the following values.

Value	Meaning
FILE_STORAGE_TIER_FLAG_NO_SEEK_PENALTY 0x00020000	Tier does not suffer a seek penalty on IO operations, which indicates that is an SSD (solid state drive).

`TotalNumberOfTiers`

Total number of available tiers for this disk.

`NumberOfTiersReturned`

Number of tiers that fit in the output.

`Tiers`

FILE_STORAGE_TIER structure that contains detailed info on the storage tiers.

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